I went to window>tile vertically and then tried to get out of it but can't. there is no check by it. then I clicked on tile horiz and cascade. nothing gets me back to my original window. How do I do it??? Thanks.
If it is set to tile vertically, to get out of it just double left click the title area of one of the panels (the area above the rules). That is how it work on a pc.
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