accidental panning

[Randy Dunlap]

Hi,

Sometimes I press some key (or combination) that causes the logical
(or virtual) screen size to be larger than the physical screen size and
then Xfce4 (4.12 from opensuse.org) starts panning the screen left, right,
up, or down every time I move the mouse just a little bit.

Does anyone know what key(s) cause this?  And is it possible to undo it
without exiting and restarting Xfce4?

thanks,
-- 
~Randy