macOS - Windows are off the screen ...

I had an issue earlier where my chosen Twitter client, Tweetbot, somehow wandered off the screen, lurking off to the right.

Whilst I could see Tweetbot when I hit the F4 key to open Mission Control, I couldn't actually get to it :-( 

Thankfully the internet ( what, all of it ? ) had the answer: -

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OS X, particularly recent versions of the operating system, do a good job of corralling application windows by either not allowing a user to resize a window beyond the boundaries of the screen or by automatically snapping a window to a second display for those with multi-monitor setups. But sometimes — due to errors, bugs, or when disconnecting an external monitor — an application window can get "stuck" partially or completely outside of the visible area of the Mac's display, and getting it back can seem impossible. Thankfully, there's a quick and easy step you can take to automatically fix an off screen window in Mac OS X, and it's called Zoom.

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If you can see the green zoom button, it's the best way to bring the missing portions of your OS X application window back into view. But what if it's the top of the window that's off screen, and you can't see the zoom button at all? In that case, you can achieve the same result via an option in the menu bar.

Simply select your desired application to make it active by click on its icon in the Dock (you should see the application's name in the top-left corner of your OS X Menu Bar, next to the Apple logo). Then, also in the Menu Bar, click the word Window and then Zoom. If you have multiple windows open in the same application, you can also select Zoom All to bring them all to the correct position at once.

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How to Resize an Off Screen Window in Mac OS X

Bottom line, I hit the Tweetbot icon in the Dock

and then chose Zoom from the Window menu

Now the app is back where it should be

Nice :-)