I'm migrating to Qlik Sense from Tableau, I'm trying to add percentage labels instead of the numbers. I can't seem to find an option in which I replace this.
Your measure is not a percentage - it appears to be something like Sum(Sales) - so your labels will match. Without knowing what the percentages represent, it's hard to guess what formula you might need to replace Sum(Sales), perhaps Sum(Sales) / Only(Target)?