You can switch your theme by following these steps.
Note: Themes are not available in GroupMe on the Web.
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Select the Open Navigation menu.
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Select Settings .
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In the App Theme drop-down, select your theme (System Default to match your Windows theme, Light, or Dark).
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Select the More menu.
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Select Settings .
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Under Themes, select Adjust automatically or Turn on dark theme.
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Select the More menu.
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Select Settings .
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Select Theme.
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Select Light, Dark, or System Default.