Start in the Main Entry module and select the Entries that are being visited, and navigate to the Bulk Edit screen by clicking the Actions button at the bottom of the screen. Once there, you'll want to Select Fields in the upper right corner of the screen. In the field selection, keep scrolling until you pass Related Tables. Typically, at the very bottom of the Related Tables section, you'll find the Visitors table, from which you'll want to add the Visitor Status and VisitorID(so you can verify that it's the intended visitor) fields. After checking your fields and hitting Close, click Set Values in the upper right. Change Visitor Status to Departed, and select Update Records.