ASUS ROG Swift 360Hz PG259QNR > turning off = black screen but still visible windows

[Mappi75]

Hello,

ASUS ROG Swift 360Hz PG259QNR

When i turn the monitor off the screen goes black but you can see slightly the browser window
and i can move it and the monitor shows it..

At the first moment i thougt it was a burning image into the display..

I reset the factory default too and use the original displayport cable.

[Mappi75]

Edit:

still not working..
... at first i thought it worked :Enable on my Z690 Apex ERP (S4+S5) in the bios > then the monitor goes really off.

but it does not.

I replaced the power brick and all cables with my second display
but its still the same.

For those who want to test:

open paint (which start with a white screen) move the windows to a smaller square
and power off the monitor you still will see this white square.

It looks like the display turns off only the backlight..