UPROPERTY on components & simulate physics

I’ve got two beginner questions, I couldn’t find any info about:

  • I had all my custom actor’s components set to “VisibleDefaultsOnly” in the header-file. Then I changed one of them to “EditAnywhere”, but apparently it has changed all the other components as well, because I can now modify them all in the editor. Can someone please explain this?

  • And then I am wondering why I can check “Simulate Physics” in many different components of the same actor, even where it doesn’t seem to make sense. Can someone please explain, what difference it makes, where I make the check? Should I always make the setting in the root component?.. Or in all components?..