QUESTION: What -Exactly- Do Project 'Configurations' Do?

…Are they strictly about ‘visibility’, or do they store/recall other stuff as well?

I mean in the Project Window.

TIA,

—JC

PS @SB: You may wanna re-think the term ‘configurations’. You use that word so much in the docs (configuring this, configuring that) it’s confusing as a term of art. And searching the PDF is kinda useless.

Nobody’s using these?