When creating a Store, you have the option of adding products from a collection, an order, an existing store, or a presentation. If you add products from a presentation and the presentation has a template applied, you have the option of copying the template banner image and branding from the presentation into the Store.
When you select a presentation that has a template applied, the option to copy the branding will appear. You can toggle this off if you do not want to copy the template into the Store.

If toggled on, the banner and branding will copy from the presentation template into the Store.

