The solution is to disable Cloudflare's Rocket Loader when editing any page using the Divi Visual Builder.
To do this, login into your Cloudflare account and go to Page Rules and click on the Create Page Rule button. Next, set the URL field to https://website.com/*et_fb=* (replace website.com with your own domain) and "Then the settings are" to "Rocket Loader" and ensure it's set to OFF. Lastly, click on the "Save and Deploy" button to apply the rule.
Divi uses “?et_fb=” as the URL for the Visual Builder editor, so adding /*et_fb=* to the end of your domain in Page Rules RocketLoader settings will fix the jQuery library loading issue right away. 👍