We would like to create a category called Private in which we can create posts that won’t be publicly linked to, but for which we can privately send a URL to the post.
How can we cause this Private category to not show in the list of categories in the sidebar?
If I have to add PHP code to make that happen, how do I do it?
The Ultimate Category Plugin does not do what I want. Posts in the excluded category do not show up in the Blog of my test site: https://thinkglobalgreen.org/tech/blog/
But the “Private” category that I excluded shows up in Categories widget in the right sidebar, and one can then see all the posts in that category, so they are NOT hidden from the public: https://thinkglobalgreen.org/tech/category/private/