In Harmony 2 applications are built by selecting options in the Options tab of MPLAB Harmony Configurator under the MPLAB Harmony & Application Configuration menu. For example, to add the Graphics Stack to an application the option “Use Graphics Stack?” is enabled under Harmony Framework Configuration > Graphics Stack: 

In Harmony 3 project components are selected from the Available Components panel within MHC. The Harmony 3 equivalent to the “User Graphics Stack?” checkbox in Harmony 2 is to double click (or drag) the Aria Graphics Library component into the Project Graph. 

To better understand how to configure graphics-enabled applications in Harmony 3 it helps to focus on an existing application, such as aria_quickstart's aria_qs_e70_xu_tm4301b configuration.