Switch GPU

Just downloaded Dimensions 2.1 and opened for the first time. I get a message saying to switch to my discreet Nvidia GPU. It says to:

1. Right-click the Dimension application icon.
2. In the context menu, click Change Default Graphics Processor.
3. Set the NVIDIA card as the default GPU for Dimension.exe.

There is no such option when I right-click on the app.