Hello, I am using UE4.21 for vive focus(sdk 3.0.2).When I packed my project into vive focus, the menu that popped up by pressing the home button did not show, it was black (ES3.1).There was no problem with ES2.0.I checked the materials and particles and found that the GPU particles in the particles and some nodes in the materials would affect the normal display of the menu.Remove these menus to display properly.I don’t know what went wrong, but the materials and particles rendered correctly in the vive focus.