distorted view at full screen

Hello!

I’m trying to set up a homepage with a sidebar. It works until the screen reaches a specific width, then the sidebar is still intact, but the main area is squeezed into a narrow field (See “Kontakt”-page on my homepage). The same error occurs also with text and occurs mostly at screens with high resolution. It seems not to be an issue with my plugins but perhaps with my oceanwp theme. For testing purposes I tried deactivating all of my plugins and the problem remains. If I set the content layout to “full width” in the oceanwp settings the problem is solved, but then I have obviously no sidebar, so this is not an option. I’m very grateful for any help!

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