not a problem, just a comfort feature to hide unused so I can see what's bound more easily.

Describe the solution you'd like

a checkbox with an apply button where when the box is ticked it's default is to hide unbound spells/abilities.
clicking apply again temporarily unhides unused/unbound spells/abilities

Describe alternatives you've considered

scrolling :)

Additional context

Add any other context or screenshots about the feature request here.