How-to Display more than 12 posts in RSS Feed?

I have tried to set my RSS Feed (Settings/Reading) to show more than 99 posts in my RSS tag feed. My feed continues to only show 12 posts in the feed.

Example Tag and Feed: (This tag has about 100 posts but only displays 12)
https://blogs.caryacademy.org/wp-content/tag-feed.php?tag=edotour

How can I display more posts in my RSS Feed?