Chrome OS offers a variety of keyboard layouts for its on-screen keyboard, also known as the software keyboard or touch keyboard. If you’d prefer the layout for another region or language, here’s how to change it.
This is also particularly useful if you can’t see the Ctrl and Alt keys on the software keyboard and need to enable them, which is a problem some Chromebook users have reported.
First, click on the clock to open the system menu and notification tray; then click on the Settings icon.
Scroll to the bottom and click “Advanced.”
Scroll a little bit further until you see the “Language and Input” section. Click on “Input Method” to expand it, then click on “Manage Input Methods.”
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Source: How-To Geek