If you have "Platform management: Sites" permission, you can manage the membership for all sites in your organization.
Ways to remove site members
You can remove site members in four different ways:
Remove via a user's profile: This is the best way to remove a single user from multiple sites or levels. This method requires the "Platform management: Users" permission.
Remove via a site or level's profile: This is an alternative way to remove multiple members from a single site or level.
Remove via the site matrix: This is an alternative way to remove multiple members to multiple levels.
Remove via CSV upload: This is an alternative way to remove multiple members from multiple levels.
Remove via membership rules: This is a way to automatically remove users as site members using rules based on their custom user fields.
