The world maps comes with Antarctica continent hidden by default, since the majority of people doesn’t need to display it. However, we can’t neglect a full continent, right?
To enable Antarctica again you just need to remove the value AQ from the ‘Exclude Regions’ field in the Regions tab of your map.
Once you empty the Exclude regions field, Antarctica should display again.
If you’re using the Pro version of the plugin, I recommend you to use the Natural Earth projection, which makes the map look better. Example below.