How do I remove the sidebar from the pages?

Hi everyone,
How do I remove the sidebar space from my website’s pages? On this test site, especially on the “ECF in the community page” everything is moved to the left in a very condensed way because I think there wants to be a sidebar there. I’ve combed through the theme options but I can’t seem to find how to make the page full width. Any help would be very appreciated, thank you!