This is a workaround to this old issue in Prefect v1 mentioned here: "Is there any known issue with removing parameters from a Flow and Prefect Cloud still showing the removed Parameter?" by @Jessica Smith https://linen.prefect.io/t/432795/Is-there-any-known-issue-with-removing-parameters-from-a-Flo The problem is that when removing a flow parameter, the Cloud UI doesn't delete the parameter, and it still shows in the RUN tab. It doesn't fail the job run, but it is confusing. The solution is to go to the UI > flow’s SETTINGS > PARAMETERS tab > RESET. The list of parameters and default values should now reflect the values in the code. When going back to the RUN tab, refresh the page and check that the Inputs are correct.