No, I mean what program are you using when you go to the print button, print menu, or the like.
One is typically in something like Microsoft Word, Libre Office Writer, one's web browser of choice, etc., when one does whatever it is that's needed to trigger something to print.
Once you've done that, sometimes you get your printer's own dialog coming up, but it depends on how the program invokes print. The print dialog used by your printer may be slightly different than mine, which is a Canon MG5500 series, but virtually all printers have the features I'm about to describe.
Here are two examples of the Page Layout tab of the Print Dialog for my printer, the first being the normal page size (which is the default type for most printers):
Notice that the option to automatically reduce large documents is checked by default. If whatever you happen to be looking at in the program you're viewing it is a large (as in would print very large at 100%) document that the program already scales to allow you to see it fitted to the screen somehow, it's possible that it might be being automatically processed to "shrink to fit" the paper size you're using.
Another possibility is that someone, somehow at some point switched the default options for your printer to use scaling (or possibly fit to page):
If you're trying to print what would normally fit on a regular 8.5 x 11 sheet of paper at 100% size, but someone has tweaked the printer such that scaled output is now the default and it's at 20 or 30% of full size, that will shrink the whole thing down to a tiny portion of the page.
This might also have nothing to do with your printer itself, but the print settings in the program you're printing from. I have frequently seen web browsers do some "interesting" things as far as scaling goes and I've had to grab my partner's laptop when he's printing something that appears normal sized on the screen but is printing in tiny size to see where he's printing from and what the print settings are from that program (usually a web browser) just before he hits the Print button.
Tiny printing is almost always correctable by you, the end user, but you need to figure out what's causing it first, and you haven't offered enough information about what you're trying to print and what program you're trying to print it from for me to give you much of any specific guidance.