Explain the problem as you see it
The "main supertag" determines which fields to use in Build Title from Fields.
In a recent situation, I had a node with 3 different supertags. I added a fourth tag that I wanted to be the main one. I needed to remove and re-add the three tags in order to achieve the wanted effect.
Why is this a problem for you?
In my case, I have 100s of nodes that I need to apply this change to, which takes time.
Suggest a solution
Quick select the main tag OR drag and drop to switch supertag order