In the past I've just gone in to revise the listing and then scrolled to the bottom and it's been there. I've never used the business tool. I do my listings and revisions on desktop PC. If you're trying to alter the listing on mobile and the option isn't there, perhaps try and view the desktop site in your browser and log in there, rather than via the app.
Though I've haven't listed anything for a few months so the functionality might have changed.
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