Is Collab safe?

Hi, I’m new to unity and have never used Collab Before. I’m hiring a freelancer to help me with some code that I’m stuck on and he wants me to set up Collab and add him.

My questions are: is Collab safe? And can he basically see all the changes I make to the game? Can I take him off the project when I feel necessary?

Yes, you can remove members from your team and he won’t have access after that in your project.