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Select the ellipsis (...) next to your initials or profile picture at the top of the app.
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Select Settings and then choose Appearance and accessibility.
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Under Theme, choose one of the following:
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Follow operating system theme, applies system theme.
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Light, displays dark text on a light background.
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Dark, displays light text on a dark background.
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High contrast, displays mostly white text on a black background, with bright color accents.
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To exit Settings, select Chat, Calendar, or another option in the left nav bar.