Disable v4 form composer

Version 4 form composer is very buggy (at least for me, and for today).

How can I go back to the old form composer?

It is possible to change between the v3 and beta v4 builder in your account settings page:

https://www.jotform.com/myaccount/settings

You may need to clear your browsers cache/cookies after doing so for the currently set builder to load.