I have been using Unity for nearly 10 years, so I feel a bit ashamed to have to ask this.
This is the first time I’ve been using the scene visibility features in the Hierarchy view and now I’m stuck with some objects being permanently invisible. See this screenshot:
I have been editing the StatsMenu object, so I made the other children of Content (MainMenu and BodyMenu) invisible. I cannot turn them visible again. I have tried clicking each and every visibility icon in the Hierarchy view. I also tried making the root object invisible and visible again, hoping for this to apply recursively to the entire scene, to no avail.
I did check the docs (2021.1), but that specific invisibility icon with the small rectangular “stop” icon is not even listed there. So, my questions:
What does the invisible symbol + stop icon mean, and what did I possibly do to get there?
How can I turn these objects visible again?
Is there some way to revert all objects in the scene to be visible?
As I said, I tried clicking all of the icons, and tried to apply visibility recursively. Those objects with the special icon (invisible + small rectangular symbol in the bottom right) will remain invisible, no matter what I do. Those icons are not appearing in your example video, neither do they in the documentation.
OK, the desperate approach of closing the scene and re-opening it again solved it. The objects were simply visible again after re-opening the scene.
Apparently this feature isn’t entirely free of bugs yet - I hope this thread helps anybody running into the same issue.
Also, now that it’s working again: the small rectangle corresponds to the triangle in the documentation (case B). Either the documentation or the editor has to be updated here, because this confused me a lot.