it seems that it cannot detect the second video card

CREATXR

my laptop has second video card geforce gtx 850m.

but in the infomation, it don't has the second video card.

 

Current OpenGL Version:	4.2.0 - Build 10.18.10.3496
OpenGL Provider:	Intel
Hardware:	Intel(R) HD Graphics 4600
Features:
MultiTexturing	Supported
Shadow Map	Supported
Hardware Antialiasing	Supported
OpenGL Shading Language	Supported
Pixel Buffer	Supported
Pixel Buffer Size	Not Enabled
Maximum Number of Lights	8
Number of Texture Units	8
Maximum Texture Size	16384 x 16384

mjc1016

Is there a physical or BIOS switch for it?

Have you installed the Nvidia drivers?

CREATXR

yes, it's oem system, it has been installed.

in blender, i can select to use gtx 850m.

in daz studio, it  hasn't the switch.

fixmypcmike

Do you have NVIDIA Control Panel installed?  See what card DS is set to use.