My second monitor is a smart board (touch screen, no keyboard). I need to be able to move windows back and forth from both. From my smart board, to bring a window into view, I could right-click the taskbar and choose "Move Window to Next Monitor". Great. But when I tried to do the same from my computer, that option was missing from the menu. Now it seems to also be missing from the smart board. Where did it go? Are there any other options? The whole point is for it to be more convenient than endlessly dragging windows back and forth, or pulling up a keyboard each time.

Thanks for the help. See attached.

Oh, is that what's happening? It's a touch screen, so right-click is done by tapping and holding. Perhaps the Shift key is "stuck" somehow in the on-screen keyboard.