For some reason there is a “v2” in my theme, and in the page to edit the name that v2 does not appear. I want to clarify that when I first submitted the theme, I didn’t like it, so I made another version and edited it in the json.
Click the Editar button. The fields beneath will then become editable. After you make changes, click the Save Changes button at the bottom of that area.
Were you already able to make the change you wanted?
No 
I tried what you said, but that edits directly to the product page (Proton Carbon – Get this Theme for 🦊 Firefox (en-US)), and when installing the theme, in Manage extensions>Themes, that’s where the “v2” is presented
It’s fixed, I had to upload a 1.2 version to fix it.