To make your post grid wider, go to your WordPress dashboard and open the page editor or customization tool you’re using, like Elementor, WPBakery, or Divi. Select the post grid element, and check for options like Column Width or Container Width. Set it to Full Width or increase the percentage (e.g., from 80% to 90%). If the grid still looks narrow, adjust the number of columns for better spacing, and reduce or remove any left/right margins or padding around the container. This should give your grid a wider and cleaner look
Your site uses the Variations theme, which is a block theme. You’re also using the default block editor, so don’t go installing another plugin just for this.
It seems this “Market Insights” is displaying POSTs but you’re manually inserting the Query Loop block here.
If this is supposed to be your “blog” page displaying your latest block posts, go to SETTINGS > READING and set this page as the “Posts Page”. This setting will override any content in the “Marketing Insights” page and display your latest blog posts instead. It’ll also use the wider blog template from the Variations theme.
On the other hand, if you only want to display a filtered collection of your posts on this “Marketing Insights” page (instead of the latest posts), then the approach you’ve taken is the way to go.
You may widen the layout globally for all pages on the site, for all PAGEs (excluding POSTs and other views), or ONLY for this “Market Insights” page. I’ll recommend asking in the Variation theme’s own support forum — so the theme’s authors and user community can assist you with this: https://ww.wp.xz.cn/support/theme/variations/
Good luck!