If you go to the following divi theme settings page:
=> hidden link
You will notice the setting where you want to display sidebar, on left or right of the page:
Screenshot - hidden link
As said, sidebar is controlled using Divi and your page layout is also controlled using Divi. I do not see Toolset Types plugin involved here. As sidebars and page layouts are controlled using the Theme. So you will have to play with the Divi theme settings.
But there is not option for full-width content (nor sidebar). In projects I don't want sidebar. That's how the site was displaying projects before updating.
Here is the Divi Doc that shows how you can disable the sidebars:
=> hidden link
However, I've added the following CSS code to hide the sidebar as well as to make the layout full-width as per the above Doc I shared at:
Dashboard-> Appearance-> Customize-> Additional CSS
How you want to display the content you should adjust your content now and I suggest for more help you should contact the Divi theme as I certainly do not how how exactly was your single project page used to display.
I do not have any other suggestion at the moment as I shared I'm not sure how those pages were build and another thing is that as you confirm that only Toolset Types plugin was installed and using Toolset Types plugin you can only create structure as I described before in my previous reply and structure does not affect the theme layout or sidebars.