Click on the bottom edge of the window & drag downwards to expand the window. None of this should even be happening as there's a designated minimum window height which I've seen WINE get wrong at times & there's checks in place when it's opened to try to get it to revert to a default window height if what was stored is deemed to be invalid but that's either not working for you or something else is messing with the window handling that I'm not seeing from any of my current dev installs.
