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Has something happened in Lightroom Classic v11? When I try to create a new Collection Set it locks up LR. I have to restart LR and then it works again. It never allows me to create a Collection Set. This has never happened to me before the update.
Try resetting LR's preferences:https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/
LR sometimes soils its preferences file, and resetting it can fix all sorts of wonky behavior. That article explains how to restore the old preferences if resetting doesn't help.