Headlines and Titles of Works

Q. How should the phrase “out of” be capitalized in a title or heading?

A. The phrase “out of” is listed as a preposition in Merriam-Webster (among other dictionaries), but Chicago treats the words in phrases individually when applying title case. Accordingly, the word “Out,” which is an adverb in that phrase, would be capitalized (according to CMOS 8.160, rule 1).

[This answer relies on the 18th edition of CMOS (2024) unless otherwise noted.]