when looking at my apple purchase history. where is a find or sort button.

In your account details in the iTunes Store of the Music App on a Mac you can peruse your entire purchase history by year but there is no search function.

M1 Mac mini, macOS 13.2.1; Watch, series 7 GPS/cellular, watchOS 9.3.1; iPad Pro 2nd Gen, iPadOS 16.3.1; iPhone 12 Pro, iOS 16.3.1; TV 4th Gen, tvOS 16.3.2; HomePods, audioOS 16.3.3 and Airport Express w/ Airplay 2