Wording.

Quiet

A visual tone that reduces contrast, motion, and visual competition to create a calm, unobtrusive interface — one that doesn’t demand attention.

Example usage
The reading view strips away navigation and uses a quiet typographic treatment so nothing competes with the text.
Editor’s note

Quiet is not the same as minimal. Minimal is about quantity — fewer elements. Quiet is about volume — lower intensity. You can have a complex interface that is still quiet. Notion is quiet. Linear is minimal.