You can view group membership on the Groups page or on the Users page.
Note:
You must have the Identity Data Admin role to create or edit groups. With the Identity Data Read Only role, you can view groups and group membership, but you can't create or edit groups.
Viewing group membership on the Groups page
The Groups summary page shows the current members of a group.
Viewing group membership on the Users page
The User details page shows group membership for a particular user.