Hello,
This issue here has not been fixed: https://archive.joomshaper.com/forums/front-end-editor-is-grabbing-all-inline-css-from-a-certain-class
I encounter the same issue on both Sp Page Builder Pro 3.x and 4.x. In my opinion, the front end editor must reflect the front end of the website exactly, otherwise it's useless.
You can see exactly what I am talking about here: https://screencast-o-matic.com/watch/c31UDrV0odj
As you can see, the second text block title is also red on the front end editor, even though on the actual front end it's a different color.
I hope you can get this fixed, because you don't seem to want to add backend editor to Sp Page Builder 4, even though in my opinion this is a huge mistake.

