Sidebar not appearing on pages, only blog posts


I’ve got the same problem as this: Shapely: Sidebar not appearing on Portfolio pages. - #19 by colorlibsupport

My website is
Example page: Kontakt Albert - Computernørden
Example blog post:

As you can see, the side bar, with title “Howdy”, is being shown on on the blog post, but not on the page.

Hope to hear how this can be fixed.