Which Screen support 'This item' Data option

I think I know how I managed to ‘lose’ it:

  1. Create a Show New Screen action on a Button
  2. Change your mind and decide you need a custom action
  3. Create a custom action with a Show New Screen and voila (reset form)
  4. Try to get it back by reinstating the original - no joy

The rules are custom actions, although they have names, cannot be found by name or reused and if you change them they are lost
and
Custom forms are also lost if you change the action that navigates to them.
This is the desired functionality.

I’m a slow learner but have I got that about right?

So to help avoid that I could always use a custom action, in case the Show New Screen is not enough and I need to Set Columns or somesuch. Would that help protect me from having to redo the Screen?

I think this is a similar description: