0. Goto the Chrome Web Store and get Chrome Remote Desktop, and launch
1a. If you are using Chrome Browser: Go to a new tab, find the remote desktop application, right / control click and select "Open Full Screen"
1b. If you are using Chrome OS, click on the Apps button at the bottom
find Chrome Remote Desktop - you may need to click on the second pane as here
alt / right click on it and select "Open as Window"
Click into 'Screen Options' and select 'Full screen'.