From Window mode to Fullsize?

[Darclite]

I used once the window mode for WoW, but i cant turn it off anymore.
What do i have to do to turn it off?
I tried it with the cosmos***** but it dosnt work.

[MorphiusFaydal]

Check video options in the WoW options menu.

[Darclite]

THX it works now !!!