Use Discord markdown to format text as smaller-looking:
Use single backticks for inline code: `text`
Use triple backticks for code blocks:
“`
text
“`
Use quote formatting with `>` for a compact look:
text
Use a smaller font only through Discord client mods or custom CSS
Use zoom out in your browser or Discord desktop app with Ctrl/Cmd + –
Reduce system display scaling or app zoom in your device settings