You will find the corresponding option inside:
Dashboard >> Appearance >> Customize >> BuddyPress Nouveau >> Group Front Page.
Here you will get the following options to configure the default front page for groups.
- Enable or disable custom front pages for groups.
- Enable or disable widget regions for group homepages. When enabled, the site admin can add widgets to group pages via the Widgets panel.
- Display the group description in the body of the group’s front page.
Group Front Page Settings: