When you create a SharePoint site, an Office 365 Group is created for that site. The members of the group all have the same level of access to the contents of the site including files and folders. The permissions assigned to group members give them direct access and group member can also give access to other people inside and outside the tenant by sharing files or folders with them.
The Manage Assess Option allows SharePoint site owners to see what content non-site members are able access and to manage assess accordingly.
Task: A description of the task that your users are looking to accomplish.
Instructions:
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Outcome: What users can expect to happen after completing the steps in the how-to knowledge base article.