I thought the option only appeared if your system was compatible. Unfortunately, I don't know why it was there before and now gone. However, with nVidia cards, your best bet for speed and compatibility is OpenGL.
Windows 10 Pro x64 | i7-9700K @ 4.6-5.0GHz | MSI Z370 Gaming Plus | MSI RX 5700 8GB Factory-OC | 16 GB DDR4-3000
