Hiding students on the whiteboard when they go into debt is a database level configuration setting that has been moved to the following location shown in the article.
This article will teach you...
Where to locate the 'Hide Name on Whiteboard Based on Student Debt Limit' Functionality.
Go to Kitchen Manager > Sites and select a site from the Sites list.
Go to the Meal selection  tab in the Site details window.
Enable student Pre-selection  checkbox > Hide names on whiteboard based on debt limits  checkbox.
The option to hide names on the Whiteboard based on debt limits has been updated so students can still choose menu items that do not breach their debt limit e.g. free packed lunch.