Spaces (top and bottom) between headings, dividers and paragraphs

I use the Customizr theme. There are spaces (top and bottom) between headings, dividers and paragraphs that I can’t remove. I spoke with the support of Elementor plugin that I built the pages with and they told me that the spaces come from Customizr theme.

How can I reduce these spaces?

The page I need help with: [log in to see the link]