Purpose

Display controls are widgets that can be added to various pages to better configure them. They can be customized to show specific information and will automatically align to the context of the screen. For example, a Treatment Display Control on the Patient Dashboard may show all treatments for a patient, but will limit treatments for a single visit when used on the Visit page. 

You can find information on how to show/hide display controls on the dashboard here.

Refer this to configure display controls in print

List of Display Controls

Below is a list of Bahmni Display Controls