Xcode (not App) Playground: blue ribbon/stripe in the gutter

In the left gutter of the editor view for an Xcode Playground page, you see a stripe/ribbon that tracks the hovering cursor.

Questions:

  • What is this called?
  • In what way is it useful?
  • So useful it's compulsory, or how can I turn it off?
  • After clicking Execute Playground I would like the playground to execute. How do I go about this?

Xcode help and documentation, nothing; DuckDuckGo, nothing, just the good news of publishing apps from your iPad, then child recreation.

I saw it used in a WWDC23 session, but I didn't catch any remark on it. My mind does wander; but… if it's wandered so far as to wipe it from the web, then the ghost of Philip K. **** walks among us.

If I am working on line 42 out of 170, and I want to see it execute it in the context of the whole page, I must first scroll to the bottom, click the blue circle, and ⌘Z / ⇧⌘Z to get back to what I was working on. Is this correct?

Maybe if I stopped worrying and learned to love the strip, I'd appreciate it, but not yet. Please tell me how to be happy with the ergonomics.


Off-topic…

:… because every search result from the web and Apple documentation is about these:

  • Xcode
  • Playground
  • Singular, not "Playgrounds"
  • No "app" in the name.
Xcode (not App) Playground: blue ribbon/stripe in the gutter
 
 
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