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Open Settings from the account menu at the bottom left of the sidebar, then choose Appearance. Settings opens full-screen with sections down the left.

Theme

Choose a theme:
ThemeWhat it does
SystemFollows your macOS light or dark mode setting automatically.
DarkA dark color scheme.
LightA light color scheme.
The color palette shown alongside is a read-only reference, not something you edit.

Common questions

More answers are in the FAQ.