http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2022/01/21/Disable-the-rounded-corners-in-Windows-11.html
Attach to winlogon.exe - this is the process that spawns new dwm.exe instances in case it crashes. After attaching, use .childdbg 1 to have it break and also attach to child processes spawned by it. Press g to continue, and then kill dwm.exe .