Hello, Webnim,
Thank you for the reply.
Please check our demo – https://xstore.8theme.com/elementor/demos/niche-market/ , you will find the same spaces/margins on the sides. This is not a bug or problem, these margins are normal behavior, and it is the reason that we name your changes as additional customization.
Our support team can help or guide you through existing settings but additional customization is outside of our basic support scope. Hope for your understanding.
Kind Regards,
8theme team