That many-to-many has messed you up. You need the custom filter to be able to say ‘is equal to’. Once you have it as one-to-many, you can use the toggle in theory, but see here for how that can cause issues with your workflows: Toggles - Split Actions | Voters | Adalo
You can create a ‘toggle’ with much more flexibility in future by following the guidance on this thread: Is here a way to hide an element? - #4 by grid7