The same issue was happening to me. In my case, I converted the existing 4.27 (large scale including World composition) project, and many functions such as Nanite Overview did not work as well as everyone else.
This thread should always be on top. I’m glad that there are many people who have the same problem as me. I hope it can be resolved.
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And Okay, RHI > change DX12 is successful my project