How can I enable the 'unselect' option for variants in the Symmetry Theme?

Hii,

I am using symmetry theme- when the customer choses a variant, he presses on the variant.
Then, he can press on any other variant and watch the images. But, on each variant I can enter only one picture which mean I am uploading all my pictures to the product itself not in a specific variant.

After pressing on any variant, we can’t unselect it, we can only move from one variant no an other which hide all my general pictures I uploaded.

Hope I was clear… I would like to know if one of you knows how I can enable the “unselect” option from every variant?

thanks so much for your help