If you are building a modpack that it's over a hundred mods, and if for some reason you need them all OFF. You have to do is click each one, the only way I have found is to just remove the mods folder to turn them all OFF. But it has it's issues sometimes when it's pop back in it doesn't read all the mods.
It would make sense to have a button or a switch, with confirmation once clicked/switch that you are about to turn OFF or ON all the mods. That way you don't also hit it by accident.
Thank you for your time.