Choose a world mode. Epic Game Builder opens the builder/editor preloaded with the packaged full world and imports the packaged world objects and mesh assets into inventory. Empty World and Populated Builder World open lighter builder starts. Full Game World launches the current XWorld runtime. Openworld Builder launches your original builder-side full game world with zombies and chunk loading.
This copies your current avatar look, attachments, colors, scale, and transparency into an enemy preset you can drag into the world later.