After spending hours (with Chat GPT not providing solution) trying to restore my normal light background (search pages, email and other apps suddenly turned black), I found that the cause wasn't the usual Windows Theme or Dark Mode settings.
Here's what finally worked:
- Click the three dots (…) in the top-right corner of the affected app (your browser).
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Choose Settings from that menu.
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Go to Appearance (not Personalization, which is listed if you choose settings from the Windows page)
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Find Page Colors (modifies the colors you see on the pages)
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Click Off (not the color that matches your chosen theme)
This immediately returned my background to normal light colors.