Hi Jeremy, it’s not possible to hide those groups with this role “Explorer” - as mentioned in the following documentation, this role allows users to create, edit and share dashboards they created:
https://help.gooddata.com/doc/growth/en/workspace-and-user-administration/managing-users-in-workspaces/user-roles/
• Explorer can access dashboards in a workspace on a view-only basis. The Explorer users can access Analytical Designer*, and create and edit insights. They can also access, create, and edit Dashboards*, and share dashboards they created. The navigation bar is visible, but the Manage page are not available. Role identifier:
explorerRole
If none of the existing user roles does not meet your business requirements, you can request a custom user role. For more information, see
Create a Custom User Role.