World composition is empty and white

I use UE4.19.2
And I created 1 levels(Default level) in editor.
But world composition is empty and white.
When I zoom out to max size, it display a ball…
What’s wrong?How can I fix it?

281441-捕获.png

UE4.22 work on this is good. Maybe it is a bug only for 4.19.