If Classic Email Templates drop-down is missing in Salesforce Lightning Experience, make sure the Email Template and Related to fields are added to the quick action layout.
![](https://www.infallibletechie.com/wp-content/uploads/2019/07/Related2BTo2Bto2BEmail2BAction2BSalesforce.png)
Email Quick action with Related To and Email Template:
![](https://www.infallibletechie.com/wp-content/uploads/2019/07/Classic2BEmail2BTemplates2Bin2BSalesforce2BLightning2BExperience.png)
Email Quick action without Related To and Email Template:
![](https://www.infallibletechie.com/wp-content/uploads/2019/07/No2BClassic2BEmail2BTemplates2Bdrop2Bdown2Bin2BSalesforce2BLightning2BExperience.png)