Toe in, how it works?

I am a little confused as to how toe in works. My simplistic brain says the speaker axis should point directly at the listener yet I have never had a pair of speakers where this is the case. My current speakers seem happy with the slightest amount, say 5 degrees. As I add more toe in the sound stage becomes quite narrow, the image becomes much wider as they approach the straight ahead position. Whats going on with toe in and speakers?

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