How to Default Fullscreen in Shipping Package

We are using 4.7 version of the engine.

We are having difficulty getting a shipping package to default to fullscreen upon starting. We are stuck with a window version of it, and even upon fullscreen, the taskbar and window frame are still visible. How do we fix this?

Thanks!

dupe of How to Default Fullscreen in Shipping Package - Platform & Builds - Epic Developer Community Forums