The process for packaging a project with the UE4 HoloPlay Plugin is the same as packaging with any other project but there are a few settings to be aware of.
For the standard packaging process, you can view the UE4 Documentation here: https://docs.unrealengine.com/en-US/Engine/Basics/Projects/Packaging/index.html
All settings set in Project Settings->HoloPlay Plugin will also be maintained in the build.
By default, when running a packaged project, there will be two render windows, one window in the Looking Glass display and one window in the connected PC display.
If you would like to render only to the Looking Glass display you can check the box in the dropdown of the play button that says “Lock in main viewport”.