How do I remove faint shadow background?

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I use an old Samsung S7 and have somehow changed my settings so that I have a faint shadow pattern appearing benlhind most of the apps I use. It doesn’t appear to be a "background". I have changed the background and played with themes and can’t work out what I’ve actually done.

It’s annoying as it makes the text on most screens harder to read.

Thanks for any help.

Mark.

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