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Access these settings by clicking your avatar at the bottom left of the sidebar, selecting Manage account, then opening the Preferences tab.

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Appearance

Select the display theme:
OptionBehaviour
LightAlways use the light theme
DarkAlways use the dark theme
SystemFollow your operating system setting automatically
The preference is saved to your account and applies across all devices where you are signed in.
To quickly change your appearance, click your avatar at the bottom left of the sidebar and select Appearance.