How do I change email format for all forms at ones?

I am changing email formats, but there are too much form. It will take too much time to work on individual forms. Is there any way to make it quick?

Thanks!

Unfortunately, we have no option for to change email formats of all forms at ones. I can suggest you copy the source code one of your email templates and paste it into all of your forms' auto-responders or notifications. 

To get the source code of email template, please edit your form and go to the form settings. Then edit your auto-responder or notification whichever you want to copy. Finally, click on the "Source Code" button in the text editor and get the source code.