The open window expands to fill the screen. I have to move the cursor to the top of the screen to make menu items (file, view, history, etc.) appear. I've restarted it and it does the same thing. Please help!
Sounds like you're in full screen mode. Hit ESC to exit.
If that doesn't fix it then you could have accidently zoomed the screen. Hold down Control while you scroll with the mouse or trackpad. One direction zooms the other unzooms.
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