How to Delete purchase history
How to Delete purchase history of a particular app
iPad Air, iPadOS 14
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You cannot delete an app from your Purchase History. You may only hide it.
Hidden Apps -
http://support.apple.com/kb/HT4928
M1 Mac mini, macOS 11.0.1; Watch, series 5 GPS/cellular, watchOS 7.1; iPad Pro 2nd Gen, iPadOS 14.2; iPad Air 2, iPadOS 14.2; iPhone 12 Pro, iOS 14.2.1; TV 4th Gen, tvOS 14.2 HomePods, audioOS 14.1 and Airport Express w/ Airplay 2