How do I change the list that triggers a flow?
At this time, the only way to change a trigger for a flow is to clone the flow and adjust to the desired trigger. It is important to note that triggers can only be changed within categories. For example, if your flow is triggered by a list or segment, you can only adjust to be triggered by another list or segment. If the flow is triggered by an event, you can only adjust to be triggered by another event.
If you need to adjust your flow trigger from a list/segment to an event, or vice versa, you will need to save out your email templates from that flow and build a new flow from scratch utilizing the desired trigger and the email templates from your original flow.