I have 3 UV sets and one retopogroup, but that makes no difference if you need more.
You see, i get 3 UV Sets (Bust_head_bottom, ...._right and ..._left) and my Baking Options.
Now i have 3 Surface Materials, that is important.
My export options.
You see on the left 3 texture sets and i could hide it on the right side.
Maybe that helps.