I just opened InDesign to knock out a PDF but I couldn’t work due to the above problem. The top of the application window disappeared under the menu along with my scroll bars. I am running macOS Mojave. I couldn’t grab the window and pull it down.
This problem is related to running two or more screens. You have to revert to a single screen in your OS to get things back to normal – apparently this is a fairly long-running Adobe bug. Come on Adobe, this is unacceptable! You may see this behaviour in other Adobe apps, so hope this helps if this is you.