How do I get a window back on the screen when it moved far, far away?
From the article:
Switch to the application, say by clicking on its taskbar button or by
Alt+Tab’ing to it. Then type Alt+Space to call up the System menu: You
should get a window floating at the edge of the screen. Type M to
select Move, then press an arrow key to enter Move mode.
Additional remark by @WebSolProv:
It would appear that something happens with IE that causes the developer tools window to be shrunk to the height of the header bar and width of about 2 inches. By using this solution you can then move the the window into view and enlarge as usual.