A Gallery in Sprout Studio can be either:
Attached to a Shoot, and therefore organized on that Shoot's page. Go to the Shoots > Galleries page to view all Galleries attached to a specific Shoot.
Unattached, and therefore not associated with any specific Shoot. Go to the Galleries page to view all Galleries (including those attached and unattached).
You can set whether a Gallery is attached or not (and to what Shoot) when you are creating the Gallery in the "Add Gallery" modal, or you can set it/change it when you are editing the Gallery.
To change whether a Gallery is attached or not (and to what shoot)
1. From inside your Gallery go to Settings
2. Click availability on the sidebar and Attach to
3. Click Shoot
4. Choose which Shoot to attach the gallery