pfSense

On a system with a lot of interfaces or whatever entries to display in the dashboard widget, the list can be filtered using the existing widget tool panel. That has an "All" button which is handy for putting everything back. But if the user wants just a couplr of interfaces (for example) shown out of 50, it is tedious to un-checked all the unwanted ones.

If all items are already selected, then make the "All" button say "None" and pressing it will uncheck the whole list.

Ten the user can easily check just a few items in the list.