Enabling and Disabling User Accounts
Note: You must have organization-level admin rights to do this.
Note: If you disable a user account, the user account is not deleted.
To enable or disable a user account:
Setting Up Automatic Disabling of Inactive External User Accounts
You can use the organization-level settings to specify when inactive external user accounts are disabled. You can also set an email to be sent to users before their user account is automatically disabled.