Yes — "be" is always capitalized in title case because it is a verb.
"Be" is the infinitive form of the verb "to be" and is always capitalized in title case. All title case style guides — AP Style, Chicago Style, MLA Style, NYT Style, and AMA Style — treat verbs as principal words that receive capitals.
Writers sometimes confuse "be" with prepositions or articles because of its brevity. But the word functions as an infinitive verb — as in "To Be or Not to Be" — and is capitalized wherever it appears except in sentence case styles.
In the famous title "To Be or Not to Be," both instances of "Be" are correctly capitalized as verbs in Chicago Style and MLA Style. "To" is lowercase as a preposition or infinitive marker, and "or" is lowercase as a coordinating conjunction.
APA Style, Wikipedia Style, and Sentence Case lowercase "be" in the middle of a title since those styles only capitalize the first word and proper nouns.
"Be" is only two letters long but is unambiguously a verb. It is capitalized in all title case style guides as a result. The two-letter length applies the same capitalization rule as a ten-letter verb.