Remove Uncategorized and Wisdom From Showing Up

I am using Frontier Post plugin for my blog pages at

When my members Create a New Post they must select their category for the blog to show up under their name.

I have changed the name of Category to Author so that they will understand, however there are two other categories that show up in the list.

They are Uncategorized and Wisdom. I use them both so they cannot be removed from the categories list, but I would like to hide them if possible.

Please see screenshot.
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Thank you.