How to enable multiple branches for different users in Git for Shared Development Environments on IRIS?

We have installed IRIS on a separate server that we access remotely and copied all code and data to it so we can test IRIS before we do the move. We develop directly on the server. We Use VsCode to code but sometimes we might need to go to cache studio for some tasks.

We were interested in git for Shared Development Environments, we have installed it on a server with IRIS 2021 and configured it by following the instructions and videos of InterSystems summits we found online. We initialised a local repository on the server, added some files to start testing branches.

While testing the Git for Shared Development Environments we noticed that the settings for namespace are the same for all users and settings for user are different for each user, but setting for a user are only the username and email. We also noted the when a user checks out a branch it is not checked out for himself only but also for the other users accessing the server. Any changes done from any user are all on the same branch. We cannot find a way for different users to work on multiple branches simultaneously. 

Could you kindly give us an indication of what we are missing?