2019.2 how to use PC Dynamic Resolution

I have seen the dynamic resolution feature on the PC side already supported in the 2019 version, but I opened the two checksums according to the official introduction and added the official test code but did not respond after modifying the resolution, and the return of GetLatestTimings The parameters are all 0. Does anyone know how to use this correctly? There is no change in the mobile test.
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I know how to make it work!!!
Just in Project SettingsPlayer cancle Auto Graphics API for Windows and add DX12 API
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