You're in complete control of your visibility on CoLab.
By Default
Public: Nothing. No one can search for you or see your profile.
Connections: Only people you've mutually connected with can see your shared info.
Context-Based Sharing
When you connect with someone, you choose what they see:
You can share multiple context types with the same person.
Changing What You Share
Go to any connection and tap "Manage" to update what context types they can see.