Theme allows you to set several general UI design features.
The menu can be accessed via Menu > Design > Theme
Title Bar
Title bar: Set title bar background color, title bar foreground colors (i.e. for displaying the title), title bar tint color (for navigation actions), app tint color (for messages in the app). For the title bar, you can also select custom fonts - see more on this here.
Tab Bar
Tab bar: Set the tab bar font (or custom fonts), tab bar background color and tab bar foreground color.
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