@Kristy_Huang , thanks. It does appear to be a bug as I noticed that the issue only occurs in that challenge’s sandbox instance in my account. When I moved to another module’s sandbox, I learned that the missing elements I referred in this post as well as the Edit in JSON link I was looking for in my other post here were located in the same place as that of your screenshot.
Fortunately, I was able to complete this module as the challenge’s completion criteria didn’t require me to finish Step 14 and above.
Thanks for the responses.