Global Styling
To change page-level backgrounds and fonts, click inside the box below to select it, then change background properties and/or font properties in the Properties palette.
Page background and fonts
To change shared background and font properties across multiple widgets, click on one of widgets below and change background and/or font properties in the Properties palette:

Heading, TabBar, EdgeToEdgeCategory |  | Buttons, CheckBox, RadioButton
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Widget Styling
To change styling for particular widgets, navigate into the appropriate section below, click on a particular widget below to select it, then change styling properties in the Properties palette.
Heading:

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ToolBarButton:
TabBar and TabBarButton:

RoundRectList and EdgeToEdgeList:
(Note: ListItem styling is shared between RoundRectList and EdgeToEdgeList.)

Button: |
ToggleButton: |
CheckBox: |
RadioButton: |
TextArea: | Text Area
Switch: |
TextBox and ComboBox: |
ComboBox list: | Previous choices ComboBox Item 1 ComboBox Item 2 More choices