I've mailed with Keith Lammers, mid December 2021, about FB Messengers latest patch caused the DF move_to_next_monitor button to disappear.
This specific problem was solved for me in Beta 12
Then my friend made me aware that apparently there are 2 different FB MSG;
His version downloaded from FB is different from my copy from MS Store.
His has the option to update from within itself, mine does not.
We both tried to update each our own, but they were both up to date and still different buildnumbers.
I then downloaded/installed the one from FB an now had 2 copies installed
Both with same version number, but different buildnumber.
(mine 142.0.0.6.106 (353127182)
(his 142.0.0.6.106 (353127249)
Ok, so I uninstall the one from MS Store and use the one from FB... which is *not* affected by DF beta 12, hence again missing Titlebar Buttons....
Sooo, could ya look at it again please?