Using the existing UCD Email Templates, you can easily modify emails according to the business requirement.
Follow the below steps to modify the email templates:
1 - Go to the Setup menu.
2 - In the Quick Find Search box, enter Email Template and select Classic Email Templates.
3 - Then, in the Folder drop-down, Select Update Client Details Templates, and the managed Email Templates will appear.
4 - Now, you can select the email template according to the requirement, for example, as shown below. Click on the Email Template Name
5 - It will look like the below image, then click on the Edit HTML Version.
6 - Now, please edit the template as it's required and click on the Save Button.
You'll then see the emails going as per the enhancements.