By default, Chromebooks will work in 'Extended' Desktop mode.

To set this to duplicate and mirror the display of the Chromebooks primary screen, you'll have to adjust a setting.


Select the Time from the bottom right to display the options menu.


Next, Select the Settings 'Cog' icon from the Top Right.



This will open the settings page in the Chrome Browser.


Scroll down the page and look for 'Device', one of these options is 'Displays'


Enter 'Displays' and select the checkbox to 'Mirror Built-in display'




Your chromebook is now set to duplicate.