The phrase highlighted is called an Adjectival phrase. See the reasons for that below.
An adjective phrase is a phrase with an adjective as its head. Almost every grammar or syntactic textbook or linguistics terminology dictionary defines the adjective phrase in a similar way.
An adjective phrase, also known as an adjectival phrase, is a collection of words that includes an adjective that modifies (alters) a noun or pronoun. Adjective phrases are a fun and kaleidoscopic method for defining people, places, objects, and events (nouns essentially).
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Full Question:
Highlight every prepositional phrase in each of these sentences. Then, indicate whether each phrase is an adjective phrase or an adverb phrase next to each bullet point
When Elena sat on the fire escape, she was above Eugene’s backyard.