Text alignment issue with main Blog page. Is there a way to make content that is left justified be centered on the page?

Question is in the title. I'll attach how it ends up looking (left) and how I want it to look (centered).

(also, there doesn't appear to be an option to choose a fixed content width, only a percent and then full or inset. Is there a way to set up a fixed width?)

Thanks.

Just to be clear. I want to be able to center content on the main blog page, but be able to justify that content/text as left justified.

When I choose "center", it not only centers the main content block (so to speak), it also center justifies all the text, which looks stupid. I'll attach what it's doing (I def like that the entire content is centered, but I need the text/etc to be left justified).

Squarespace is so limited, so I'm just trying to find something that will sorta make it look better. Ultimately, I would be able to center justify the titles and the smaller date text (with non- personal) that I'm showing in this screenshot of each entry on the main blog page....and then only justify left the remaining content in each entry (the main text, images etc).

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Why do I need to provide a link? It's basic stuff. When you try to "edit section" for a main blog page (the front page) with "single column blog", it only allows you to left, center, right align "text" content. And I provided the images of what that shows, including one in my original post of how I want it to show. It aligns the text left but ALSO aligns it almost completely left on the page itself, when I want the content centered on the page.

You should be able to clearly see these settings yourself without me linking my site.