If you are authorized to do so within your workspace, you can set public projects to private.
As a result, team members in your workspace who are not explicitly authorized to do so cannot see them either directly or indirectly or have any other access to it.
To turn a public project into a private project, do the following:
Set a public project private
Go to Projects via the navigation menu on the left.
Click on the 3-point menu on the right side of the project that you want to make private and select Edit from the context menu.
Set the Project visibility to Private using the dropdown under Settings.
Confirm your changes with Save changes.