A frequent question on Trailhead for new admins and developers is how to edit the fields displayed in quick actions, global actions, and Lightning components. Most of the time these fields are managed through the Compact Layout for an object.
From there you can clone the default layout and create your own. Required fields must have a value for the action to work, though these fields can be left off if they have default values or there is a before action that sets the value.
© Scott S. Nelson