There are a new access level for Guest users in order to limit their permissions : Permission level Access level Same as member users Guests have the same access to Azure AD resources as member users Limited access (default) Guests can see membership of all non-hidden groups Restricted access (new) Guests can’t see membership of …
Update 19/05/2021 : Microsoft has updated the rollout timeline. The roll out will begin at the end of May You will soon be able to create a policy that automatically revokes access for external guests to SharePoint Online (SPO) sites and individual OneDrives after a defined period of time. When will this happenMicrosoft will gradually roll …