I’m just getting back to the app again but there’s no place in the app that says how to use it. I’m trying to set a reminder and potentially a recurring one if that exists.
Currently continuing to swipe right past item completion will pull up the reminders interface. You can remove or edit the reminder using the same gesture once set! Recurring items and reminders are on our list of features to get in, but currently they are not supported. User @islecicle posted a temporary workaround, at least for a recurring list of items.
You can currently find the Gesture Guide in the List Library which includes several more of the core gestures.
With the Clear X update the List Library may undergo a rework - during that time we will be moving the tips found in the Gesture Guide (along with some additions) into a free quote pack that will be applied by default for new installs - current users will be able to find and apply the same pack in Personalize.