Are you talking about the margins on a document you are typing? If so the kind of printer or Windows 10 are not relevant. Are you using Word? if so open your document then click on Layout on the top bar. Then click on Margins on the next row down. Then make your choice.

Depends on what you're printing and via which software ... spreadsheet, word processing, photo editing or graphics design, pdf viewer, web browser, etc.

I just press the print on screen, no special software. Simple stuff

Printing a picture? Webpage? Word document?

Usually, I am printing out a recipe I typed into notepad. But the margins are too wide so it takes 2 pages. Can you help with that?

I found this:

The margins and the page size are independent, and actually controlled by two completely separate processes: the margins are set internally in NPP in the Settings > Preferences > Print > Margins, as you found. (FYI: 0.5in ≈ 13mm).

WordPad or some other more-featured word processing software is better than Notepad for such tasks. WordPad provides for font sizes and other formatting to fit the text to a page. Notepad does not.

There should be a way to select/configure your documents in your printing app, shouldn't there? Did you open it to check yet?

You can download Apache Open Office and use that instead of Notepad. I've been using Open Office for many years - it is free because it is open source. It is a good free alternative to Word.

Having special software is a big plus and is extremely helpful, and it is still simple.

Go into the printer properties and it should tell you what to do. If not right there, then look into the advanced properties.

If you're using Word, go to layout and it's all there.

In notepad: I clicked on EDIT then try changing the font size after highlighting the whole page?