I tried this several times and never see the F2 prompt...just the dell logo.

I tried this several times and never see the F2 prompt... just the dell logo and if I hit the dell logo it does go into this.... screenshot.

1. Restart the computer.
2. As the system logo is loading, press the F12 key to get to the system BIOS.
3. Select BIOS Setup.
4. From the BIOS screen, expand the Video group.
5. Select Switchable Graphics.
6. Un-check the Enable Switchable Graphics box on the right side of the screen.
7. Select Apply at the bottom right

see screenshot, which is not BIOS setup that I want? It won't let me do anything and only shows the stock 630 Graphic Card and not the  nVIDIA GTX1650 graphic card

Turn on (or restart) your computer. During POST, when the DELL logo is displayed, watch for the F2 prompt to appear, and then press F2 immediately.