Customize widget if using shortcode

I am using this widget with shortcode, as there is no place for it in my theme, within the body of the blog page. I see the list of shortcodes, but doesn’t seem to be working for me yet. I actually would like to display all posts in full (not just excerpt and thumbnail, but rather the whole posts on the blog page).

Or at least, how can I use the nice customizer that is on the widget interface, if using a shortcode?

Thanks!
David
https://sonomaenergymedicine.com/blog/