File Explorer, please help

On my new Lenovo laptop, with Windows 11, everything is, thanks to you, as I would like and as it should be. There is one little thing that really bothers me, so please help. Namely, in File Explorer, when it opens, a black border appears around Quick access, which disappears when I click somewhere, and appears again when I open FE again (this is in Croatian). I have tried everything that Google and AI advise, but it does not help.

Does anyone know how to get rid of this? Please help.