Does Anyone Know How to Activate The Chapter Feature on Google Docs?

I'm writing a story in my free time. I wrote a story a while ago and was to please to discover as I wrote along that my chapters had been cataloged into an easily accessible catalog I could access in order to edit and expand more easily. I have no idea how I activated the feature before, nor do I have any idea... show more I'm writing a story in my free time. I wrote a story a while ago and was to please to discover as I wrote along that my chapters had been cataloged into an easily accessible catalog I could access in order to edit and expand more easily. I have no idea how I activated the feature before, nor do I have any idea of how to activate it again. Anyone have an answer?
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