If you want to set default groups for all your organisation users, go to this article:
About Teams
Grape uses so-called "Teams" to group users in your organisation. They can be manually managed or connected to a user management system like ActiveDirectory.
1
Teams Page
Click the cog wheel in the top-left corner of your chat to open the context menu and click the "Manage Members"-Button to get to your members page.
Click on the "Teams" Tab to get to the teams management page.