To uninstall an add-on navigate to the Marketplace and click the Installed tab and search for the add-on you want to remove.

There are two options to disable the add-on for your system, organisation, group or account. 

1) Deactivate - disables the add-on functionality, but it remains remains listed in the installed tab

2) Uninstall - disables the add-on functionality and removes the add-on from the installed tab

To deactivate an add-on use the switch on the add-on card.

To uninstall an add-on for your group or user account, click Uninstall add-on