How to chage a membership plan to recurring?

Hello,
I have a few subscription plans that I would like to change from non-recurring to recurring.
How can I change them to recurring such that existing subscribers to those plans will either 1) have their plans changed to recurring or 2) be able to renew their plans as recurring (preferred).

It was my understanding that, if I changed a plan from non-recurring to recurring, all subsequent new and renewal subscriptions on that plan would change to recurring. (that's what I want to happen)
However, I notice that when I do change an existing plan from non-recurring to recurring, the "Renew Membership" option and its Process Renewal" button go away from the "Membership Pro » User Profile" menu item. It would appear that existing users who have subscriptions to that plan would not be able to renew, and thus would not enter into the recurring subscription.

Confer this discussion from February 2020: Changing Plan to Recurring Subscription
As well as this one from February 2020: No manual renewal options when the plan is recurring

Here are the settings from one of the plans:


Here is what the User Profile menu item looks like (for an existing subscriber to the plan) when the plan is set to NOT recurring:


Here is what the User Profile menu item looks like (for an existing subscriber to the plan) when the same plan has then been changed to recurring:



Here is the Membership Pro configuration:



Thank you for your assistance,
Ari