The Milkdown extension should have the option to change the font sizes (or fonts in general) — Prompt23.

Done 2026-09-22. Three settings under the Markdown extension’s row in the Extensions panel (user or workspace scope): font size (px, 8–48, default 16), font (a CSS font-family for the note body; empty = the theme’s), code font (for code blocks and inline code). They become CSS variables on the rich host (--mk-rich-size, --mk-rich-font, --mk-rich-code-font) that rich.css applies to the ProseMirror content; headings scale with the size (Crepe sizes them in em). Settings file keys: editor.rich_font_size, editor.rich_font, editor.rich_code_font. Verified in rich.mjs (22 px Georgia). Not done: a font picker (type the family), and fonts for the code editors (CodeMirror has its own theme; a follow-up).