How to change title on variation groups

I’m having some issues with how the titles display when I create a variation group. I grouped multiple products and had them sorted by flavor and size and the title for the group just says “chicken cat treats” I want it to say “human grade freeze dried cat treats” How do I change that?

I did another group with all one flavor and had it sorted by size. Amazon set the title as “Scotchblue painting tape” The products are pet treats. I don’t know where that came from. How do I control what title is displayed on variation groups?