When I was working on Power Automate, I had to remove one of the parameters in it and when I clicked on the more options on the Input property and tried to delete it, the option is disabled.
Then I checked the Power Automate flow thoroughly and understood that the parameter is being used in one of the condition.
And I removed the parameter from the condition, then the Delete option is enabled and deleted the unnecessary field.
Hope you got the solution to resolve this problem.
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