If you want to limit access to specific projects (and any associated insights or video sessions), you can limit access by changing the project access for those projects. There are three access levels, with different degrees of permissions:

To manage access for a project (and any insights or sessions that are added to that project), go the the project page and then click Settings. You need to have Full access permissions to a project to see this setting.

Users that are Observers are automatically restricted to View only permissions for all projects, insights and studies.