Forms can be used in multiple processes and tasks at the same time to limit the maintenance.
When you open a form that is used as a part of any process, information about it is displayed in the Form Editor pane. The displayed message defines the number of processes in which that form is used: This form is used in [number] process(es). Show details.
When you click on the Show details part of that message, a Form dependencies pane is displayed. From there, you can go directly to processes that use the form.