Chrome OS offers a variety of keyboard layouts for the on-screen keyboard, also known as a software keyboard or touch keyboard. If you prefer layout for a different region or language, follow these steps to change it.
This is also useful if you do not need to see and activate the Ctrl and Alt keys on the software keyboard. Some Chromebook users have reported a problem.
First, click on the clock to open the system menu and the notification bar. Then click the Settings icon.
Scroll down and click on "Advanced".
Scroll a little further until you see the "Language and input" section. To expand, click Input Method, and then click Manage Input Methods.
Find the keyboard you want to use and check Click the box to the right to install the keyboard settings. For example, if the Ctrl and Alt keys are not displayed on the current on-screen keyboard of your Chromebook, click the Advanced US Keyboard check box to enable it.
Now when you open the on-screen keyboard, tap or click the voice tag icon to the left of the space bar and select Select the desired keyboard from the list.
The layout of your keyboard changes immediately – you do not have to restart anything. 
Chromebooks do not support third-party software keyboards, such as Android. Google has plans to do this in the future. Until Google allows the use of third-party keyboard apps on Chrome OS, the keyboard layouts included with Chrome OS are your only options.
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