Undigging, because it’s the only thread I can find about it.
My Setup is: I have a row of buttons, and there can be only one selected at the same time, and at least one must be selected at any time. So basically when you select something, the currently selected one deselects, and you can’t deselect by clicking again.
Judging by the tooltips, the “InteractableWhenSelected” was what I was looking for as well, but it’s not working as op mentioned.
So I peeked inside the code and I don’t now why, but basically whenever 'Interactable when Selected’ is checked, it also checks if Toggleable (one option below) is unchecked… It might be a bug, it might be a feature, I’m not digging into it, but it makes InteractableWhenSelected useless if you want to have a Toggleable Button, but not interactable.
My solution is similar to schmigel’s first one (because “not hit testable trick” doesn’t work for me, and I’m not itching to investigate it).
Turn everything Toggleable, and set it to not toggleable when it’s selected. When you want to deselect it with BP just unset Toggleable right before it
cheers