Windows applications launching in a visible window setting...
Turn off the secondary screen and check if the issue resolves.
It just repeated the same task using one screen.
Both displays may go dark or only one appears. Execute the PowerShell command in PowerShell and press Enter at the end to proceed.
I didn't disable the secondary monitor, I just turned it off.
I completely disconnected it.
The display is the only component showing the game.
Additionally, please note that the situation began when you received a Keychron keyboard.