Editorial-2. It would help me a lot if you lend a hand. It is the last thing I need to make the page perfect. The posts have a lot of margin on the sides
If so, it looks like the selector for the posts margin is “.post__inner”. Just make the max-width bigger (right now, it’s set to 760px out of the box). You can either edit the main.css file using the theme override, or edit it in Tools & Plugins > Custom CSS.