How to open UE Editor when downloading source from github?

I downloaded release 4.19.0 from github so that I could cross compile for linux from windows. I followed the steps A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums

Linux does not come up as an option when I run UE4.sln

the wiki said that the option might not come up and to just open the editor. But I don’t know where to find or open the UE4Editor in source.