Setting main content width doesn’t work

Hello @petrchutny,

Your website is built by Elementor page builder and its container overrides the theme container, so in this case, you need to manage it on your page builder settings.

First, ensure your desired sections won’t be full-width and stretched.

Then navigate to site settings on Elementor page builder and in the layout tab set the container size, for more information about container size on Elementor page builder, please read these articles:
1. https://elementor.com/help/global-layout-settings/
2. https://elementor.com/help/site-settings/

Also, you can set 100% full width for your pages on the edit page:

Furthermore, you can set full-width sections on elementor for some sections like the image or other widgets:
1. https://postimg.cc/jWSchpfZ
2. https://postimg.cc/vxZ6RyQN

Best Regards

Thanks so much for your time and response @skalanter ?? I’ve solved the issue. The sections were full-width so I’ve set them to Boxed and that had fixed the issue!

You’re most welcome, and I’m glad we could help.