To edit a group, go to Space Settings > User List > Group, and click on the group's name in the list. This will redirect you to Nulab Apps.
You can change the title or user role permissions by clicking the gear to the upper right.
To remove a member, simply click the downward arrow next to their name and select “Remove”.
By clicking the settings icon to the right of the group name on the Group List page, you can proceed to the group’s settings page. To delete a group, click on the “Delete” button at the bottom of the page.