How do I get rid of this overlay?

I had no Wi-Fi for a short time on my Dell laptop and then suddenly this display came up (which had never been displayed before) I now have Wi-Fi again and the display has not gone away for days no matter what I do.

And you clicked the cross in the lower right corner and clicked OK?

Yes, but if that was possible I wouldn't ask

What kind of function does it trigger when you click on the symbol?

That's right, but every now and then it happens that you can't come up with the simplest solution.

Maybe you will find something here?

https://www.winboard.org/threads/wlan-icon-ausblenden.86965/

Nothing and when I go on it with the mouse OK appears (see image 2) and when I click on it nothing happens either