How to Change the Font Size and Scale of Link's RPG Font
Adjusting the Font Scale
Link's RPG Font replaces the default font textures, but the size at which text renders is controlled by Minecraft's GUI Scale setting. Go to Options → Video Settings → GUI Scale and cycle through the available options. A larger GUI scale makes the RPG font bigger and easier to read on high-resolution displays, while a smaller scale keeps more text on screen.
Per-Element Considerations
Different parts of the interface respond differently. Chat text, the action bar, and item tooltips all use the same font but at different base sizes. If chat feels too small but menus look fine, you may need to compromise on GUI Scale or use a chat-focused mod that lets you adjust chat size independently. Signs and book text also use the font, so check those in-game after changing scale.
If Text Looks Blurry
Blurry text usually means the GUI scale is set to a non-integer value or your display resolution does not match. Try setting GUI Scale to Auto first, then manually pick the value that looks sharpest. Note that the RPG font's stylized letterforms are inherently more decorative than the vanilla font, so some loss of crispness at small sizes is normal — increasing scale is the most reliable fix.