Adjust the minimum size to be something around 1280x1024.

Also adjust some colors color for the dark theme.

Contributes to CURA-5772.

plugins/PrepareStage/PrepareMenu.qml

@@ -46,7 +46,7 @@ Item
         Cura.MachineSelector
         {
             id: machineSelection
-            width: UM.Theme.getSize("sidebar").width
+            width: Math.round(0.8 * UM.Theme.getSize("sidebar").width) - configSelection.width
             height: prepareMenu.height
         }
 
@@ -54,8 +54,8 @@ Item
         {
             id: configSelection
             visible: isNetworkPrinter && printerConnected
-            width: visible ? Math.round(machineSelection.width * 0.15) : 0
-            panelWidth: machineSelection.width
+            width: visible ? Math.round(UM.Theme.getSize("sidebar").width * 0.15) : 0
+            panelWidth: Math.round(0.8 * UM.Theme.getSize("sidebar").width)
             height: prepareMenu.height
         }
 

resources/qml/ActionPanelWidget.qml

@@ -19,7 +19,9 @@ Rectangle
     signal showTooltip(Item item, point location, string text)
     signal hideTooltip()
 
-    // Also add an extra margin, as we ant some breathing room around the edges.
+    color: UM.Theme.getColor("sidebar")
+
+    // Also add an extra margin, as we want some breathing room around the edges.
     height: saveButton.height + UM.Theme.getSize("sidebar_margin").height
     Label
     {
@@ -231,7 +233,7 @@ Rectangle
     {
         id: saveButton
         width: parent.width
-        height: 100
+        height: 100 * screenScaleFactor
         anchors.bottom: parent.bottom
     }
 }

resources/qml/Cura.qml

@@ -291,6 +291,7 @@ UM.MainWindow
                     onActiveViewChanged: viewModeButton.updateItemActiveFlags()
                 }
             }
+
             Loader
             {
                 id: viewPanel
@@ -307,7 +308,7 @@ UM.MainWindow
                 source: UM.ActiveView.valid ? UM.ActiveView.activeViewPanel : ""
             }
 
-            ProgressAndSaveWidget
+            Cura.ActionPanelWidget
             {
                 anchors.right: parent.right
                 anchors.bottom: parent.bottom

resources/qml/qmldir

@@ -6,4 +6,5 @@ CustomConfigurationSelector 1.0 CustomConfigurationSelector.qml
 PrintSetupSelector 1.0 PrintSetupSelector.qml
 ActionButton 1.0 ActionButton.qml
 MaterialMenu 1.0 MaterialMenu.qml
-NozzleMenu 1.0 NozzleMenu.qml
+NozzleMenu 1.0 NozzleMenu.qml
+ActionPanelWidget 1.0 ActionPanelWidget.qml

resources/themes/cura-light/theme.json

@@ -345,7 +345,7 @@
     },
 
     "sizes": {
-        "window_minimum_size": [70, 50],
+        "window_minimum_size": [106, 85],
 
         "main_window_header": [0.0, 4.5],
         "main_window_header_button": [8, 4],