Checking/Unchecking blocks of contiguous boxes in Compile

I’d like to be able to check or uncheck blocks of contiguous boxes in Compile. I can do this for the entire length of boxes but haven’t found a way to leave some checked, then highlight a group for unchecking, or vice versa. Is this possible?

Highlight the first line, shift-click the last line of your intended block to highlight it, then opt-click one of the blocks. This also works for non-contiguous selections (but you use cmd click to make the initial selection, then opt-click to toggle, of course).

HTH.