Many SweetHawk apps use Zendesk ticket fields behind the scenes. There's a heap of benefits as to why we create apps like this, for example, being able to use the data in those fields throughout the rest of Zendesk such as in macros, triggers, views etc.
For more information on those ticket fields and their benefits, check out this article.
Normally you don't have to worry about those ticket fields getting in the way of your day to day ticket duty because the app is designed to also hide those fields. However, if you've restricted the app to not work for some agents, it means that the app is also not able to hide the fields.
As such, the following video will show you a workaround to hide those fields for everyone.
Disclaimer: The "Ticket Field Manager" app shown in the video below is not a SweetHawk app and is thus not supported by us. It can be downloaded from the Zendesk labs GitHub instance here.