Looks like Flow has been set up, it’s tough luck for changing the trigger?
Solved
Can the Trigger of a Flow be changed to another List?
Best answer by Manny Singh
Welcome to the community!
Yup, can’t change the trigger of an existing flow. BUT, what you can do is Clone that existing flow and in the box that pops-up, you’ll see a dropdown to Select a new Trigger.

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