Updated system, can't right click on 2nd monitor now

Worked before update, now no. Old MSI laptop, nVidia 1060mobile

What did you update? You should check with
grep -i upgraded /var/log/pacman.log
You can also write the output to a text file

grep -i upgraded /var/log/pacman.log > file.txt

Check what may have caused the issue and try to downgrade