Something draws over my screen all the time

[Matt.Murdock]

Hi, I am absolutely unable to enable or disable notifications while on website - I just cannot tap it at all. I have no idea why and tried many solutions. I stopped all apps, disabled drawing over screen, but yet no luck.
I also tried this Determine which app is drawing on top of other apps? and well... there's only one line, mOwnerUid=1000 mShowToOwnerOnly=false package=com.android.systemui appop=SYSTEM_ALERT_WINDOW
But I cannot disable that.

Any ideas? I am really desperate Thanks!