Open Chrome browser
Type `chrome://flags/#ash-debug-shortcuts` in the address bar
Set the flag to Enabled
Restart the Chromebook
Press `Search` + `Shift` + `T` to toggle the touchscreen off
Press the same keys again to turn the touchscreen back on
Open Chrome browser
Type `chrome://flags/#ash-debug-shortcuts` in the address bar
Set the flag to Enabled
Restart the Chromebook
Press `Search` + `Shift` + `T` to toggle the touchscreen off
Press the same keys again to turn the touchscreen back on