Seems like you already got this sorted.
Just wanted to point out that when you have a set of things and you can only select one, that’s a Radio Button.
Not sure if this makes any difference in UMG, since 99% of the time I code my own things to accommodate the slur of missing features anyway.
But if they have a radio button option, it just may automatically manage what’s checked without you having to jump though hoops as you did.