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Site owners have additional rights on the portal compared to contributors (site members) who are able to create and edit site content. Site owners (administrators) have access to the Sharepoint settings menu to manage the site's settings, permissions, and appearance.
To access SharePoint settings, go to the settings icon on the SharePoint header.
Manage site permissions
"Site permissions" lets you manage who has access to the site. You can change how your site can be shared and manage permissions for your guests.
For more info, visit the following article: Managing Site permissions.