Hi @maxim,
I’ve more or less already answered your questions a few times (here and there). Folders and sections are completely different things. However, you can make them match — for example, by setting all the pages of a section to be placed in the same folder. By doing this:
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The “folder” will correspond to the section and can therefore be used as a submenu.
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Your folder will not be a section (they are two separate things), but both will contain the same pages.
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You’ll be able to create a menu that only appears within a single section (Arrange > Visibility > All pages in this section).