Loading Screen System (Level Transitions w/ Progress)

Using Nav Meshes with Level Streaming, in general, seems to have some kinks…
Below are some similar issues, you can try the solutions suggested by Epic staff there (usually first answer):

https://forums.unrealengine.com/deve…evel-streaming
https://forums.unrealengine.com/deve…h-of-SubLevel=
https://forums.unrealengine.com/deve…ig-Landscapes=
https://answers.unrealengine.com/que…streaming.html
https://answers.unrealengine.com/que…streaming.html

Most promising appears having a navmesh in the Persistent Level as well as in the Streaming Levels.

Removing just parts of the examples could be a bit tricky, though if you wanted to get rid of anything and everything non-essential, you should be able to delete the “Maps” and “DemoContent” directories entirely. This would get rid of ca 400MB and leave you with just about 10MB of Blueprints.

(If you wanted to keep the UI templates working, there is currently a struct in “/DemoContent/Blueprints” that would have to stay (I’ll fix that in an update), leaving that subfolder should work though)