I have set up an automated flow to trigger on "when an item or file is modified" in sharepoint. Once I created the flow, I wanted to change the Recurrence interval which in currently 5 minutes to 30 minutes.
When I change it manually from 5 to 30 minutes, upon saving it immediately changes back to 5 min.

Being unable to change for an existing flow, I tested if the 30 minutes of recurrence frequency can still happen if I create a flow from scratch with 30 minutes baked-in from start. To my surprise, it changes back to 5 min upon saving even though I created with 30 minutes of interval. Even with this, this does not get saved , it changes back to 5 min upon saving.

Why this is happening and how can I overcome it. I want the SP trigger to look for sharepoint changes every 30 min instead of 5 min.