Single Post Content Won't Go Above 600px Width

Good Evening. I am trying to make a blog post template and am using “Row Stretch” to extend the row to “Stretch row and 1400px content” which works fine, but the Single Post Content section keeps the text centered with auto margins at max 600px width. I can add a text box to the same row and it has no problem filling the column. But for the “Single Post Content” element the text inside it only goes to 600px. How can I increase this for the template and on the site. I plan to use the “Stretch row and 1400px content” open on my pages to fill them up a bit and just want the text from single post content to fill up it’s column. Thanks!