Sending, receiving, and organizing email in Outlook.com
Dear Stan, I have exactly the same issue using the Microsoft 365 Family subscription, so I feel permitted to answer your question:
On step three, there is no option to switch or downgrade to Classic plans. Instead, I have only either the button "Switch plan" for Microsoft 365 Personal (which is not what I need), or the button "I don't want my subscription" (which I'm afraid to click, because I could lose my data).
Can you please clarify internally why I don't see the Classic plans offered?