Every person using a shared DF Code install gets their own space — their own workspaces, their own settings, their own history — kept separate under their own context. See Sharing one install with your team for the bigger picture.
The Manage Users area, visible to admins only, lists everyone on that install and lets you promote someone to admin when they need it.
Your own Profile is a read-only look at your identity record, enriched with your linked GitHub details once you've connected one — see Backing up and restoring your setup for what that unlocks.