This bug has been mentioned before. I get a black bar the size of the menu panel at the top of my screen when I maximize my Writer window in OS X El Capitan. I’m using 5.0.6.3. Is there a fix for this?
Same issue. Fullscreen support is rather disappointing. Here’s another fullscreen issue : Black screen when closing (not quiting) file while in full screen on Mac OS
Can you post a screenshot? I don’t see black bar on my Writer OSX in full screen mode.