Display post in columns except on index page

Yes, this should be possible.

Can you try setting the columns first, and I’ll try to see the best approach afterwards?: https://share.getcloudapp.com/wbuzvyNB

Kindly let us know once you’ve applied the change. Hope to hear from you soon! :)

OK, i did it. what's next?

I’m not seeing the actual design of the site from my end.

There are multiple files returning a 404 error: https://share.getcloudapp.com/JruOyNxR

Not sure if this is a security setting from your end, a caching issue, a permalink issue, a plugin conflict or something else, however, here is a CSS you may try adding to display the posts in one column on the Blog page only:

body.blog .generate-columns-container > * {
    width:100% !important;
}

Hope this helps! :)

perfect, thanks

Glad that worked! You’re welcome!