Hello,
Thank you for your reply.

To summarize what I learned,

  1. Add a custom status to RG-B and name it view
  2. In the RB-B condition settings,
    If view is true → display
    If view is false → hidden
    Set conditions
  3. To display RG-B in its custom state on W/F, set “false” and redisplay RG-A.

Is this interpretation correct?

What command do you use to unhide RG-A?
Refresh the page? Is it Display list in Element Actions?

Will it not be displayed again even if I specify RG-A in the Display List?