Guust

Like I said, have a look at the CSS of the other site.
Rather than containing the whole page to a max width, they are containing separate section, like the tile etc.
So instead of

#main-content {
    max-width: 1219px;
    margin: auto;
}

you would apply that to other elements like

.archive .entry-header, .geodir-breadcrumb {
    max-width: 1219px;
    margin: auto;
}

What theme are you using?
If you are using Divi, that theme has its own theme settings for the number of post per page.

From http://www.elegantthemes.com/gallery/divi/documentation/theme-options/

General Settings
Numbers of posts per page – Define how many posts you would like to be displayed when a user visits a Category Page, an Archive Page, Search Results Page, or Tag Page.

Thanks

You’re welcome 🙂
Happy studying 🙂

All sorted now?
Thanks

I did fix the issue, that is why I asked you to check. Thanks

WP Settings > Reading.
But that is only for WP posts, not GD listings or events.

Thanks

The Add Pet Business page was set as your Posts page.
Please check.
Thanks