How to solve visual glitches when logged in as user that has used KDE and now uses GNOME?

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I know I should have made a separate user but I did not manage to find time to do this yet, but at least I do not log in into KDE anymore.

Do you know how to solve these visual glitches (the red circle visible under the window close button and the ugly white lines under the minimize and maximize buttons of the windows)?

Thanks.

This should help to get rid of that

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