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

 
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:

ToolBarButton:
TabBar and TabBarButton:
RoundRectList and EdgeToEdgeList:
(Note: ListItem styling is shared between RoundRectList and EdgeToEdgeList.)
Button:
ToggleButton:
CheckBox:
RadioButton:
TextArea:
Switch:
TextBox and ComboBox:
ComboBox list:
Previous choices
ComboBox Item 1
ComboBox Item 2
More choices