How can I adjust the blog post content width for theme Atelier
You can change Page width option in your store admin > Sales channels > Online Store > Themes > Customize > Theme settings > Page layout.
If you want to change the width of the content of the blog post only, please add this code to the Custom CSS in Theme settings
.blog-post-content { max-width: 1000px !important; }
Best,
Dan from Ryviu