To change blog post text width, you can follow these.
You can also use this free blog tool so you can customize blog easier without using code.
#1. First, edit a blog post
#2. Hover on top right of blog post > Click Edit Section
#3. Choose Custom in Content Width > Then you can adjust text width.
#4. If you want to adjust TEXT BLOCK in Blog Post Content only, use this to Custom CSS.
div.blog-item-content-wrapper .html-block {
max-width: 300px;
margin-left: auto;
margin-right: auto;
}



