The Playthrough section of most performance pieces will have two video options called "Guitar" and "No guitar". This will allow you to customize your backing band.
Guitar
When "Guitar" is selected in your performance piece, you'll play along with the full band and the main guitarist. The main guitarist will perform the notated part.
No guitar
When "No guitar" is selected, you'll play along with the full band while the main guitarist steps away. Sometimes the main guitarist will shift to a rhythm guitar role. This allows you to be the star of the show.
If you don't see an option to toggle between "Guitar" and "No guitar", then it's likely the performance piece only has one option, usually just the playthrough with the main guitarist. You can always send us a message if you want to double check!