I have configured the SimpleHMD plug-in, selected Mobile Multi-View and Mobile Multi-View Direct, and disabled HDR. I want to test the MultiView feature of UE4, but a black screen is displayed. What is the problem? Thank you

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I have configured the SimpleHMD plug-in, selected Mobile Multi-View and Mobile Multi-View Direct, and disabled HDR. I want to test the MultiView feature of UE4, but a black screen is displayed. What is the problem? Thank you.