Pages-Duplicate- Saving Original and Duplicate as separate docs

I'm trying to figure out how to duplicate a six page Pages document and save both the original and the duplicate which I'll edit.

It seems that, in the word processing mode (very confusing that there are multiple modes) duplicates are made by selecting the first of the six pages (apparently, all six are in the same "section" -another confusing feature) and that selects all 6 pages.

Then, a duplicate can be made. But, how does one separate the original from the duplicate and have 2 separate documents, please?

Must Apple always figure out the most complicated way of achieving relatively simple results?

Thank you for your help.