You can also quickly enable Mono Audio from the Accessibility shortcut in the System menu. For more information on enabling and using the Accessibility Shortcut, see our article How to enable the Accessibility shortcut in Chrome OS.
This section explains the steps you need to follow to enable mono audio in Chrome OS, with pictures of the screen to help.
1. Click on the Time widget in the bottom right corner to open the System menu. Click on the Settings button.
2. Click on the Menu button in the Settings window and select Accessibility. If you can’t see this option, click Advanced to reveal more menu items.
3. Click Manage accessibility features.
4. Scroll down to the Audio and captions section. Click on the toggle switch for Play the same audio through all speakers (mono audio) to turn it on.
Note: If this does not work it could be because someone else manages your computer settings (an IT department or administrator). If this is the case, you will need to contact them to access these settings or for further help.