Full width row – CSS

Hello guys,
I’m really sorry, I know that this topic has been discussed several times but I’m still not able to figure out where I’m making mistake.

I would like to extend the row width to full length, but it seems there is something in my theme blocking it.
The row is already set to “”Full Width stretched”

I’ve tried several custom CSS but nothing worked well. Any suggestion?

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Many thanks for all ideas 🙂