For a project open in MPLAB X IDE, right click on the project name in the Projects window and select “Properties” to open the Project Properties window. View the Packs list to see available packs for the project device.
Packs shown as gray are not included in that version of MPLAB X IDE. To install the pack, see Install Packs after MPLAB X IDE Install. Turn off the filter to see all versions and then install the version(s) you want.