Black Square in middle of my screen

I have problem wit black square that appears in middle of my app screen between forward and stop button, see the photo.
It's not part of design and it appears when I lunch my app.
The phone is Samsung A52.
Can someone tell me what is going on?

Do you have a notifier together with a timer?

Notifier to keep screen on

Well that is your black rectangle then.

Use a different method to keep your screen on. There is such a block in Taifun's Tools Extension, or you can create a 1x1 pixel video player that loops a small video.

Or change notifer background color to transparent.


Yes, that was it

This keep notifer popup really working for keep screen on?

Yes it does!
Thanks for help, no colours solve the problem

then mark it as a solution please

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