Under Joomla 3
Go to Extensions -> Manage -> Manage. Type 'jQuery Easy' in the search box.
The free version
Select the 'System - jQuery Easy' plugin and click on Uninstall.
The pro version
Select the component ONLY and click on Uninstall. This will remove all extensions at once. If it does not, remove them one by one.
Joomla 3.10 You may see an additional Package called 'jQuery Easy Profiles'. Remove the package instead of the component (all extensions tied to the package can't be removed individually).
Under Joomla 4
Go to System. In the Manage section, go to Extensions.
Type 'jQuery Easy' in the search box.
The free version
Select the 'jQuery Easy' package and click on Uninstall.
The pro version
Select the 'jQuery Easy Profiles' package then click on Uninstall. This will remove all extensions installed through that package.