Disable PrintScreen key in Mate

From: Kevin Oberman <rkoberman_at_gmail.com>
Date: Tue, 02 Aug 2022 16:39:38 UTC
My PrintScreen key is located right between Alt and Ctrl here it gets
pressed accidentally. It does not generate a key event searching shows
disabling it with a menu item that does not exist in Mate, though it does
in Ubuntu.

At one time, I found the magic and it was fixed until an update wiped out
the fix which I can't remember.

Any idea how to do this?
Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman@gmail.com
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683