When a parameter is changed thru the UI under settings for a flow, does this automatically propagate to future runs? I usually don’t see the change reflected in a pending flow run unless I flick the schedule off and on - I only do that to be pedantic but was wondering if it is neccesary

For all changes to schedule, you need to toggle it on and off to take effect. This is because the Flow Runs are already scheduled and in the database when you make that change. Toggling the schedule recreates them with the new settings