How to "undo" the "set master pose component"

Hi,
I set master pose component of the character mesh of a pawn “A” to the character mesh of a pawn “B” and I want the pawn A to go back to his default animations but I can’t find how to do this, the pawn’s character mesh still use the animation blueprint of the pawn whatever I do. (like doing “set anim instance class”). How do I reset my character A?

Sorry for the bump but I really can’t find how to do this