FOSS Linux published a tutorial about switching graphics in Pop!_OS.

Switching Graphics in Pop!_OS 20.04 (GUI, command-line ways)

Pop!_OS 20.04 comes with the system76-power package that includes the ability to switch between Intel, NVIDIA, and Hybrid graphics modes. Here is how to use it.

Switching Graphics in Pop!_OS 20.04 (GUI, command-line ways)