https://bugs.winehq.org/show_bug.cgi?id=56071
--- Comment #4 from Rafał Mużyło galtgendo@o2.pl --- ...no idea what could be the difference, using 9.0_rc2
Technically, two monitor setup, but the second one, while connected and listed in xrandr is kept off most of the time.
Did you check if use_take_focus makes a difference ?