If you want to remove a collaborator you previously added to a cluster, you can do it from the Dashboard.
Here’s how:
Find the cluster from which you want to remove the user.
Click the ⚙️ settings button next to the cluster name.
A side panel will open on the right showing a list of collaborators.
Find the user you want to remove, click on their current permission, and select Remove access from the dropdown menu.
Once removed, they will no longer have access to that cluster or any of the topics inside it - unless they’ve also been added to a specific topic separately.