In the paper era, InDesign was a good way to control both text and images and print what you wanted. In the electronic document era, exporting InDesign documents to PDF causes them to shrink. What were 0.5 inch margins on all sides become 0.75 inch margins and everything in between becomes smaller. Ironically, Microsoft Word is now creates better PDF files than Adobe InDesign.
I don't believe that's true. How are you determining that InDesign causes PDF pages size to shrink? Chances are, you're looking at the printed output and seeing shrinkage. It's a very common error to accidentally choose the Fit or Shrink Oversized Page option in the Print dialog in Acrobat/Reader which causes that effect.
What version of InDesign? What export setting? What PDF reader are you using? If Acrobat, you can move your cursor to the bottom left corner of the page to view the PDF page size.
You are right, the printer setting was adjusted to Fit.
Thanks. It’s late at night and the deadline looms.