If you decided to remove Magento 2 Admin Email Notifications by Magefan, please follow the steps below, also you can contact our team for a free consultation in case you have any issues with Magefan's extension.
Remove Extension Files
Removing files instruction depends on a way Admin Email Notifications extension has been installed.
1. If you can find the extension files in the folder
then remove this folder.
2. If the extension was installed via the composer and its files located in the folder
then run composer CLI command to remove it
composer remove magefan/