spaces in real site and scroll

I also need to know is there an option to fix left column and remove a scroll. when I have long article left column swimming and it's not so good for the eyes. On small screens too
4. How can I made left and right spaces in a content to be small like on demo in Schedule
Look demo https://meteorg.eu/demobau/index.php/schedules
Look om my site: https://meteorg.eu/newmetheor/bg/programa/predstoyashti.html

Do you mean when scrolling down the page?

You can use this custom CSS so it will not move:

#gkHeader.affix {
	padding: 144px 72px 96px !important;
}