How to control if the high bidder's name is shown online?
By default with online bidding only the high bid amount is shown to bidders (unless it is your bid)
This would appear as:
Note: if you are signed in as a user for the organization then you will see details of the high bidder: the same item might appear as:
To see the item as a non-user would you can sign out or use a different browser to access the page.
If you want to show the name of the high bidder to all bidders you can change the setting under Website then Online Bidding
Change the Bidder Identification setting: