Some people may not know this, but as there is no HOME or BACK button you need to use the ADB command and send an input keyevent as per the instructions (3 for HOME, 4 for BACK). For those testing or playing, not very fun.
While this build is not exactly... "ready", you can have a HOME button.
Go to the APPS menu and click on SPARE PARTS. Under GENERAL (third last on my menu) there is END BUTTON BEHAVIOR. Click on that and select GO TO HOME.
Now when you press the power button it will go to the HOME screen. Hold down the button to turn it off still, this does disable the ability to put the screen to sleep with a button, but it times out quickly anyway.