User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-5489931-20201227080450/@comment-44807868-20201228130742

The tables are setting the font size through inline CSS in these tables, which's working. You can increase or decrease it as needed. Though if you want to change it with site CSS, this should do the work: And this is how the tables appear to me with FullWidthOasis (which's how I assume you want them to?):

Don't they look the same for you, too?