When I make a PDF out of a Word document for example, the PDF opens at a random size percentage and doesn't really look as expected. At 100% (after modifying preferences) the PDF is gigantic...

How do you control the size of this thing so it looks like a normal document at 100% when you open it?

Seems like it should work at the default but not everything in life is logical.

So what I'm looking at incorrectly? Appreciate any help.