How do I change the modifier keys on my Acer Chromebook?
You can change the way the search, Ctrl, and Alt keys behave on your Chromebook, or disable them altogether. For instance, you can change the search key into a Caps Lock key.
For steps on changing your modifier keys, visit Google's Modifier keys (search, Alt, Ctrl, and Caps Lock) page.
For more information, visit the Chrome OS Help Center.