It seems I've somehow keyboard shortcutted my way into a grouped spreadsheet.
I can't sort, I can't undo... I can still add to the spreadsheet though.

There are two different places I've looked for an 'undo group' button, both
are unlit so won't work.

I can't cut and paste into a new spreadsheet or all the problems come with
the paste.

Help! I can't do my work!