Place of sidebar on (optional) archive page

Hi! The following may be related to: https://catchthemes.com/support-forum/topic/posts_page-uses-primary-sidebar-while-it-should-use-archive-sidebar/ (that topic is about sidebar content, this topic is about sidebar place) By default Gridalicicous has as its theme layout: primary sidebar - content. Today I tried reversing that to content - primary sidebar through the customisation panel. This works fine for the (optional) homepage, all other pages, all posts and even post categories. However, the optional archive page (for posts) stubbornly puts the primary sidebar first. Is there any way to make this page follow the new layout as well? I was probably looking in the wrong place when I tried and failed to find a solution for this in the sidebar.php. I'm using a child theme, and I'm testing this at: http://test.gewoonmooigewicht.nl My optional archive page can be found in the menu under "Blog". Thank you very much for looking into this! Kind regards, Henriët