Public group’s summary page now also allows managing public group members, simplifying this way the management of the public group’s included users, roles, and nested public groups. From the summary page, you can search across all current or available members, add or remove up to 100 members at a time or edit/delete the included public groups
Where: This change applies to Lightning Experience in all editions
How: From Setup, in the Quick Find box, enter Public Groups, and then select Public Groups. Select a public group, and then click View Summary. Under All Public Group Members, add or remove members
