Reversing faces inside

I created a monster. Everything was fine before I edited it last time. Now all the internal faces are internal faces so the slicer is filling the inside. Actually, it wasn’t “fine” as a lot of cyan showed in the test. But I left it because I knew it was good.
It is a basically a hollow sphere with stuff inside. Somehow the inside is now not presenting as “outside” surfaces. Short of selecting every surface inside, is there an easy way to reverse the inside surfaces?

Find or orient a face correctly then right click on it and choose Orient Faces.

All adjoining faces should be oriented the correct way.

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