For LabVIEW 2020 and newer, when you step into a VI from a TestStand step, LabVIEW displays the Edit VI and reset step execution button on both the front panel and block diagram toolbars. Use this button to stop executing the VI and to open it for editing. When you click Edit VI and reset step execution, TestStand resets the step execution to the step that you stepped into. Continuing execution of the lot in TestStand will execute the VI with the modifications you made.