I saw a title in the format of “Blah Blah In Blah” while watching a television program last evening.

Problem:
The preposition “in” should not be capitalized.

Explanation:
Obviously, I don’t recall the “Blah” words.

What I do recall is that the preposition “in” was capitalized in the title.

This is incorrect.

The traditional rule has been that a preposition in a title should not be capitalized unless the preposition is the first or last word in the title.

Some people have refined this rule to say that it’s okay to capitalize prepositions that are five characters long or longer.

I believe that Microsoft Word and other software applications have contributed to the incorrect capitalization of prepositions in titles. Their titling rules usually capitalize each word in a title.

So I don’t recommend relying on these applications for help with proper capitalization of prepositions in titles.

Solution:
“Blah Blah in Blah”