I am seeing an issue where if you try to add a relationship form configured for editing to a template set up for Divi, you can't. The option is prohibited. The workaround is to add the shortcode before turning on Divi for the template. or generating the shortcode elsewhere to copy and post into the Divi module.
I have attached a screenshot to illustrate what is happening. In the top you can see that the Create an "Editing Mode" template for managing Tracks is available when you go to add it to a regular Toolset Content Template.
The bottom shows that this is prohibited when you try to do the same thing when using the Divi builder version of the content template. The way to deal with this is to either:
Start with the regular content template with the shortcode and then convert it to the DIvi version.
Or
Have the divi template set up, add the shortcode to a regular page, post or wherever it will work and then cut and paste the shortcode into whatever divi module you are using.
You might test and see if you are getting the same behaviour and let me know. You never know it maybe a conflict with something I have installed.