Do the developters have any plan to allow the 1920*1080 resolution fullscreen support for this game?
It used to work before DX11 was added, but even in DX9 mode now, fullscreen mode won't stay selected if you alt-tab out. Attempting to change it back to fullscreen just scrunches the screen, so I admitted defeat and left it at Windowed Maximized.
It's all about picking your battles with STO and bugs.
if you move your mouse to the far upper right hand corner there is a minimize button that does appear, so you don't actually have to alt-tab so that should be a simple way to get around whatever problem you're having. I've used this several times and never had a problem with it not maximizing right when switching back.