Debian stable's screen suddenly became "larger" than the actual screen

[intnsred667@tutamail.com]

   I'm running KDE/Wayland (does the same with Xorg too) on Bookworm/stable
and while using the system all of a sudden the screen became "larger" than the
actual screen -- like I was using some sort of "virtual desktop."

   I've tried resetting the monitor size in KDE's System Settings -> Display
and Monitor settings, but that doesn't work.

   I've tested and tweaked ALL of the other settings I've found and thought
might be relevant in KDE's System Settings but no luck there.

   Can anyone suggest on how to "reset" my monitor? Thanks in advance! (TIA)

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