The visibility settings in the preferences is defined in Uranium rather than Cura. The CheckBox has been moved to Uranium so that all parts of the project have access to this default styled component.

plugins/DigitalLibrary/resources/qml/SaveProjectFilesPage.qml

@@ -228,7 +228,7 @@ Item
         width: childrenRect.width
         spacing: UM.Theme.getSize("default_margin").width
 
-        Cura.CheckBox
+        UM.CheckBox
         {
             id: asProjectCheckbox
             height: UM.Theme.getSize("checkbox").height
@@ -238,7 +238,7 @@ Item
             font: UM.Theme.getFont("medium")
         }
 
-        Cura.CheckBox
+        UM.CheckBox
         {
             id: asSlicedCheckbox
             height: UM.Theme.getSize("checkbox").height

plugins/PerObjectSettingsTool/PerObjectItem.qml

@@ -18,7 +18,7 @@ UM.TooltipArea
     width: childrenRect.width;
     height: childrenRect.height;
 
-    Cura.CheckBox
+    UM.CheckBox
     {
         id: check
 

plugins/PerObjectSettingsTool/SettingPickDialog.qml

@@ -57,7 +57,7 @@ UM.Dialog
         onTextChanged: settingPickDialog.updateFilter()
     }
 
-    Cura.CheckBox
+    UM.CheckBox
     {
         id: toggleShowAll
         anchors

plugins/UltimakerMachineActions/UMOUpgradeSelectionMachineAction.qml

@@ -33,7 +33,7 @@ Cura.MachineAction
             renderType: Text.NativeRendering
         }
 
-        Cura.CheckBox
+        UM.CheckBox
         {
             anchors.top: pageDescription.bottom
             anchors.topMargin: UM.Theme.getSize("default_margin").height

resources/qml/Dialogs/AskOpenAsProjectOrModelsDialog.qml

@@ -92,7 +92,7 @@ UM.Dialog
             wrapMode: Text.WordWrap
         }
 
-        Cura.CheckBox
+        UM.CheckBox
         {
             id: rememberChoiceCheckBox
             text: catalog.i18nc("@text:window", "Remember my choice")

resources/qml/Dialogs/WorkspaceSummaryDialog.qml

@@ -275,7 +275,7 @@ UM.Dialog
             width: parent.width
             height: childrenRect.height
             anchors.bottom: parent.bottom
-            Cura.CheckBox
+            UM.CheckBox
             {
                 id: dontShowAgainCheckbox
                 anchors.left: parent.left

resources/qml/MachineSettings/SimpleCheckBox.qml

@@ -57,7 +57,7 @@ UM.TooltipArea
         renderType: Text.NativeRendering
     }
 
-    Cura.CheckBox
+    UM.CheckBox
     {
         id: checkBox
         anchors {

resources/qml/Preferences/GeneralPage.qml

@@ -304,7 +304,7 @@ UM.PreferencesPage
 
                 text: catalog.i18nc("@info:tooltip", "Slice automatically when changing settings.")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: autoSliceCheckbox
                     checked: boolCheck(UM.Preferences.getValue("general/auto_slice"))
@@ -334,7 +334,7 @@ UM.PreferencesPage
 
                 text: catalog.i18nc("@info:tooltip", "Highlight unsupported areas of the model in red. Without support these areas will not print properly.")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: showOverhangCheckbox
 
@@ -353,7 +353,7 @@ UM.PreferencesPage
 
                 text: catalog.i18nc("@info:tooltip", "Highlight missing or extraneous surfaces of the model using warning signs. The toolpaths will often be missing parts of the intended geometry.")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: showXrayErrorCheckbox
 
@@ -370,7 +370,7 @@ UM.PreferencesPage
                 height: childrenRect.height;
                 text: catalog.i18nc("@info:tooltip", "Moves the camera so the model is in the center of the view when a model is selected")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: centerOnSelectCheckbox
                     text: catalog.i18nc("@action:button","Center camera when item is selected");
@@ -385,7 +385,7 @@ UM.PreferencesPage
                 height: childrenRect.height;
                 text: catalog.i18nc("@info:tooltip", "Should the default zoom behavior of cura be inverted?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: invertZoomCheckbox
                     text: catalog.i18nc("@action:button", "Invert the direction of camera zoom.");
@@ -406,7 +406,7 @@ UM.PreferencesPage
                 height: childrenRect.height;
                 text: zoomToMouseCheckbox.enabled ? catalog.i18nc("@info:tooltip", "Should zooming move in the direction of the mouse?") : catalog.i18nc("@info:tooltip", "Zooming towards the mouse is not supported in the orthographic perspective.")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: zoomToMouseCheckbox
                     text: catalog.i18nc("@action:button", "Zoom toward mouse direction")
@@ -437,7 +437,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip", "Should models on the platform be moved so that they no longer intersect?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: pushFreeCheckbox
                     text: catalog.i18nc("@option:check", "Ensure models are kept apart")
@@ -451,7 +451,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip", "Should models on the platform be moved down to touch the build plate?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: dropDownCheckbox
                     text: catalog.i18nc("@option:check", "Automatically drop models to the build plate")
@@ -468,7 +468,7 @@ UM.PreferencesPage
 
                 text: catalog.i18nc("@info:tooltip","Show caution message in g-code reader.")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: gcodeShowCautionCheckbox
 
@@ -485,7 +485,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip", "Should layer be forced into compatibility mode?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: forceLayerViewCompatibilityModeCheckbox
                     text: catalog.i18nc("@option:check", "Force layer view compatibility mode (restart required)")
@@ -500,7 +500,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip", "Should Cura open at the location it was closed?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: restoreWindowPositionCheckbox
                     text: catalog.i18nc("@option:check", "Restore window position on start")
@@ -575,7 +575,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip","Should opening files from the desktop or external applications open in the same instance of Cura?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: singleInstanceCheckbox
                     text: catalog.i18nc("@option:check","Use a single instance of Cura")
@@ -591,7 +591,7 @@ UM.PreferencesPage
                 text: catalog.i18nc("@info:tooltip","Should the build plate be cleared before loading a new model in the single instance of Cura?")
                 enabled: singleInstanceCheckbox.checked
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: singleInstanceClearBeforeLoadCheckbox
                     text: catalog.i18nc("@option:check","Clear buildplate before loading model into the single instance")
@@ -606,7 +606,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip","Should models be scaled to the build volume if they are too large?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: scaleToFitCheckbox
                     text: catalog.i18nc("@option:check","Scale large models")
@@ -621,7 +621,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip","An model may appear extremely small if its unit is for example in meters rather than millimeters. Should these models be scaled up?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: scaleTinyCheckbox
                     text: catalog.i18nc("@option:check","Scale extremely small models")
@@ -636,7 +636,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip","Should models be selected after they are loaded?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: selectModelsOnLoadCheckbox
                     text: catalog.i18nc("@option:check","Select models when loaded")
@@ -651,7 +651,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip", "Should a prefix based on the printer name be added to the print job name automatically?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: prefixJobNameCheckbox
                     text: catalog.i18nc("@option:check", "Add machine prefix to job name")
@@ -666,7 +666,7 @@ UM.PreferencesPage
                 height: childrenRect.height
                 text: catalog.i18nc("@info:tooltip", "Should a summary be shown when saving a project file?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     text: catalog.i18nc("@option:check", "Show summary dialog when saving project")
                     checked: boolCheck(UM.Preferences.getValue("cura/dialog_on_project_save"))
@@ -811,7 +811,7 @@ UM.PreferencesPage
                 height: visible ? childrenRect.height : 0
                 text: catalog.i18nc("@info:tooltip", "Should anonymous data about your print be sent to Ultimaker? Note, no models, IP addresses or other personally identifiable information is sent or stored.")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: sendDataCheckbox
                     text: catalog.i18nc("@option:check","Send (anonymous) print information")
@@ -850,7 +850,7 @@ UM.PreferencesPage
                 height: visible ? childrenRect.height : 0
                 text: catalog.i18nc("@info:tooltip", "Should Cura check for updates when the program is started?")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: checkUpdatesCheckbox
                     text: catalog.i18nc("@option:check","Check for updates on start")
@@ -898,7 +898,7 @@ UM.PreferencesPage
                 height: visible ? childrenRect.height : 0
                 text: catalog.i18nc("@info:tooltip", "Should an automatic check for new plugins be done every time Cura is started? It is highly recommended that you do not disable this!")
 
-                Cura.CheckBox
+                UM.CheckBox
                 {
                     id: pluginNotificationsUpdateCheckbox
                     text: catalog.i18nc("@option:check", "Get notifications for plugin updates")

resources/qml/Preferences/SettingVisibilityPage.qml

@@ -36,7 +36,7 @@ UM.PreferencesPage
         id: base;
         anchors.fill: parent;
 
-        Cura.CheckBox
+        UM.CheckBox
         {
             id: toggleVisibleSettings
             anchors

resources/qml/Widgets/CheckBox.qml

@@ -1,114 +0,0 @@
-// Copyright (c) 2020 Ultimaker B.V.
-// Cura is released under the terms of the LGPLv3 or higher.
-
-import QtQuick 2.10
-import QtQuick.Controls 2.3
-
-import UM 1.3 as UM
-import Cura 1.1 as Cura
-
-
-//
-// Checkbox with Cura styling.
-//
-CheckBox
-{
-    id: control
-
-    hoverEnabled: true
-
-    indicator: Rectangle
-    {
-        height: UM.Theme.getSize("checkbox").height
-        width: UM.Theme.getSize("checkbox").width
-
-        anchors.verticalCenter: parent.verticalCenter
-
-        color:
-        {
-            if (!control.enabled)
-            {
-                return UM.Theme.getColor("setting_control_disabled")
-            }
-            if (control.hovered || control.activeFocus)
-            {
-                return UM.Theme.getColor("setting_control_highlight")
-            }
-            return UM.Theme.getColor("setting_control")
-        }
-
-        radius: UM.Theme.getSize("checkbox_radius").width
-        border.width: UM.Theme.getSize("default_lining").width
-        border.color:
-        {
-            if (!enabled)
-            {
-                return UM.Theme.getColor("setting_control_disabled_border")
-            }
-            if (control.hovered || control.activeFocus)
-            {
-                return UM.Theme.getColor("setting_control_border_highlight")
-            }
-            return UM.Theme.getColor("setting_control_border")
-        }
-
-        UM.RecolorImage
-        {
-            anchors.verticalCenter: parent.verticalCenter
-            anchors.horizontalCenter: parent.horizontalCenter
-
-            height:
-            {
-                switch(control.checkState)
-                {
-                    case Qt.Checked: return UM.Theme.getSize("checkbox_mark").height
-                    case Qt.PartiallyChecked: return UM.Theme.getSize("checkbox_square").height
-                    default: UM.Theme.getSize("checkbox_mark").height
-                }
-            }
-            width: height
-            sourceSize.height: height
-
-            color:
-            {
-                switch(control.checkState)
-                {
-                    case Qt.Checked: return !enabled ? UM.Theme.getColor("setting_control_disabled_text") : UM.Theme.getColor("checkbox_mark")
-                    case Qt.PartiallyChecked: return !enabled ? UM.Theme.getColor("setting_control_disabled_text") : UM.Theme.getColor("checkbox_square")
-                    default: return !enabled ? UM.Theme.getColor("setting_control_disabled_text") : UM.Theme.getColor("checkbox_mark")
-                }
-            }
-            source:
-            {
-                switch (control.checkState)
-                {
-                    case Qt.Checked: return UM.Theme.getIcon("EmptyCheck", "low")
-                    case Qt.PartiallyChecked: return UM.Theme.getIcon("CheckBoxFill", "low")
-                    default: return UM.Theme.getIcon("EmptyCheck", "low")
-                }
-            }
-            opacity:
-            {
-                switch (control.checkState)
-                {
-                    case Qt.Checked: return 1;
-                    case Qt.PartiallyChecked: return 1;
-                    default: 0;
-                }
-            }
-            Behavior on opacity { NumberAnimation { duration: 100; } }
-        }
-    }
-
-    contentItem: Label
-    {
-        id: textLabel
-        anchors.left: control.indicator.right
-        leftPadding: UM.Theme.getSize("checkbox_label_padding").width
-        text: control.text
-        font: control.font
-        color: UM.Theme.getColor("text")
-        renderType: Text.NativeRendering
-        verticalAlignment: Text.AlignVCenter
-    }
-}