How Do I Control Podcasts Storage On My iPad?

I keep up to date with all my podcasts, deleting viewed ones as I go along. However the amount of storage being used by podcasts on my iPad is extremely large at 1.3 Gb. Why is this and how do I control it?
Thanks,
Peter Hardaker
Podcasts is taking up a disproportionate amount of storage on my iPad. It’s due to “documents and data”. I need to free up the space.
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Peter Hardaker