Fullscreen flicker with dropdown widget[Win 10 2020.25380]

I am getting some flicker every time I open a dropdown widget in full screen
if i run with borders it dose not happen

maybe it is the same issue as this
https://forum.derivative.ca/t/fullscreen-tuik-dropdownbtn-strange-flicker/5133

Yeah, looks the same as the other report, we’ve added it to the database.

This is expected currently. When you fully take over the monitor with a borderless window the Nvidia driver enters an exclusive higher performance mode that avoids frame drops due to the Windows Compositor. Opening another window (such as a dropdown menu) throws you out of this exclusive mode, which causes a driver mode-change and a flicker. We are looking at ways to allow for dropdown menus to work better with Perform mode, but those are still in the works.
It’s a tradeoff right now, you can also make your perform window 1 pixel smaller than your monitor and that’ll avoid the driver entering exclusive mode.