Visibility settings determine what staff users get to see. Under ‘Simple’ Access Control in Settings –> Company Settings → Policy, you have two Visibility options i.e. Allow your staff users to see all items in the system OR only see assets that are checked out to them.
With ‘Only show the assets checked out to them’ enabled, the users can only see (and take actions on) items that are checked out to them. However, they can pull up limited details of other items by scanning the QR Codes. This plays out well when you have enabled ‘Public QR Code Scanning’ in Company Settings.