To be a bit more specific, these might be the settings you’ll want to experiment with:
5dd3553b-ae2f-46a6-804c-3fec7b08f3f3-image.png
Also: You can temporarily change the size of text by pointing your mouse at the window, holding the Ctrl key, and scrolling the mouse wheel in either direction.
I don’t want to change the native format of the text I’m viewing
This shows you have a basic misunderstanding about what text editing is and what a text editor does. @zanud clarifies nicely with:
(None) of file types supported by Notepad++ have font-related properties. All font names, sizes, styles used by Notepad++ are for viewing only, and they are never stored in the files.