No idea. But have you tried going up to the 'edit' button at the...

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    No idea. But have you tried going up to the 'edit' button at the top left hand side and scrolled down to 'undo'?

    Or maybe if squares still highlighted - try hitting 'esc'.

    Computers and I are not good friends, but they are generally my first tries with excel.

    Good luck
 
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