You may want to change the amount of time before your laptop display turns off or dims while on battery or while connected to a power adapter. To do this go to the Apple Menu --> System Preferences --> Battery Select Battery or Power Adapter on the side. Also see this article from Apple's support site …
Click the clock on the bottom right of your system tray, then click on the gear icon to go to the Chromebook settings. Once in ChromOS settings click on "Security and Privacy" then "Lock screen and sign-in" You may be asked to enter your password Toggle the "Show lock screen when waiting from s…