Make it possible to unhide all hidden fields as a way to reverse hide all unused fields.
I think an option nearby the other hide/show options is the most natural location:
That said, a general workbook/desktop option for showing and hiding all unused fields would be a nice addition.
Something like this was mentioned by Nora Kelmendi in .
I guess this latter should be an idea of its own, but at least it is included here too.
It saves click.
It is more intuitive to do this from the same place where one hided all unused fields.
Easier reverse makes it more attractive to hide all unused fields.
This idea came while sharing this answer: