How can I make a windows application

I’m having trouble finding any information on non game applications. I’m looking for someone to point me in the right direction. I would like to still use some of the ue4 engine code as this application may have some 3d stuff present in it. It will not just be a bunch of menus and drop down boxes.

Thanks in advance

As far as I know what you are looking for is Slate.

Slate is the name for Unreal’s custom UI programming framework. The editor interface is largely built using Slate.

You can find more information here. I don’t know how easy is to use it for non-game applications but bear in mind that the vast majority of the editor was written on top of Slate.