Is it possible to show posts with an abbreviated month (Jan 1, 2019) and not have this reflect on the single posts? So, leave the WP settings as “January 1, 2019” but have the plugin show “Jan 1, 2019”?
I just took a look through some core filters, but I couldn’t find a way to do this easily, unfortunately. Of course, the format can be changed in “Settings > General”, but that’s a global option.