Remove installations of applications or extensions
To remove an application or extension from your Chromebook, follow these steps.

click Remove extension and app for chrome extesion
Uninstall applications
At the corner of your screen, click the UP ARROW and up arrow after Launcher.
Right-click the application you want to uninstall.
Click Remove installation.
Click Remove.

Uninstall extensions
Open Chrome.
Click other, then click other tools, and then click extensions.
Click the Remove extensions Chrome icon next to the extension you want to remove.
Click Remove to confirm.
Tip: To remove an extension that appears as a button on the browser toolbar, right-click the button and select Remove from Chrome.

Disable the extension
To temporarily stop the use of an extension:

Open Chrome.
Click Remove extension and app for chrome
Deselect the active box next to the extension that you want to disable.