Hello there @itamar3009!
That’s a peculiar glitch you are encountering, it looks to be related to a GUI or graphics conflict.
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First step I would suggest, please update your OS to the latest version, and update your video drivers to the Developer version (pick the “Clean Install” option, if available).
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Then, turn off any GUI assisted tool that is currently active in your system, like nVidia Experience, or Xbox Game Bar, as these tend to create strange conflicts with UE’s interface.
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Finally, try the following fix from a similar scenario in a related thread: