Name, tagline, the project id and address, and who can see the public page.
Settings › Project details is the project's identity: its name, a tagline, its id and address, and who can see its public page.
Name is what the project is called, on the projects page and in the workspace's header. Tagline is one line under it, like Learn a language like a local. Both are yours to change at any time.
The id is the project's address: your-name.flexos.site. The repo and the Vercel project carry the same name. Rename changes it, and the address with it, so a link you have shared stops working: rename early, or not at all.
Three choices for the project's public page:
Unlisted and Private come with the plan; See the plan takes you to Billing.