Understand how pnpm works

[wlsdx]

Hello, I'm trying underding how pnpm works.

I have a node project myproject with D:/myproject/package.json. After running pnpm install, I find the installed dependencies (real files, not links) are inside D:/myproject/node_modules/.pnpm/, and there is also a folder D:/.pnpm-store/. I have 2 questions:

1. Does the global store in the documentation refer to D:/myproject/node_modules/.pnpm/ or D:/.pnpm-store/ in this case?
2. Since the dependencies' real files are installed inside the project, another project with the same dependencies will contain another copy of the dependencies' files. Why does it save more disk space than npm?