[REQUEST] add a shortcut to maximize a box

[c02y]

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Normally I open all boxes in the btop window, but sometimes, the process box is too small to show all the info such as the long command column, so I have to disable other boxes using 1/2/3 keys one by one, after I get the info in process box, I reopen all the 1/2/3 boxes again one by one.

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Could you please add a new shortcut to maximize a box such as M-1/2/3/4 to maximize 1/2/3/4 box, pressing M-1/2/3/4 again it restores the layout?

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