How do I open and start QEMU in Genymotion?

Last verified against genymotion.com:

QEMU is the default hypervisor on macOS and Linux, so you do not “open” it separately in Genymotion. Go to Settings → Hypervisor, select QEMU, restart Genymotion, then create or launch a virtual device.

Genymotion’s settings page says you can switch between QEMU and VirtualBox there, and then restart the app to apply the change: Genymotion Desktop Global Settings. The device wizard also shows Hypervisor options for QEMU, including quick boot: Get Started with Genymotion Desktop.