Click 'Enable Live Overlay' from the Live Overlay page in the Desktop App
Make sure your game window is in Borderless Windowed Mode
To enable the overlay, you need your game to run in Borderless Windowed Mode and not full screen.
Start your session
Start your session as usual. You should see the Live Overlay on the screen once you start driving.
Find and position the overlay
Once the overlay is enabled and visible, you can move it around to your liking.
Start driving
Start driving, and the overlay will show your pace and other metrics.
*Live Overlay does not work in VR or on mobile.