Find where you installed the Seated listings in your site code and add this style block just before.
<style>
.seated-events-table,
.seated-event-link1,
.seated-event-link2 {
font-size: 20px !important;
}
</style>
Notes:
Adjust the number 20 in "font-size: 20px" to find the right look for your listings.
To just change the ticket link button label size, remove the events-table line.
To just change the rest of the table but not the ticket link button size, remove the event-link lines.