Resident Evil 2 (2019) is a remake of a game of the same name that was released back in 1998. The updated version is great, but some fans might miss the original soundtrack and sound effects that used to be found in the original. If not because they were superior, they might scratch an itch of nostalgia for some.
Anyway, it's absolutely possible to change from the updated soundtrack and sound effect back to the originals in the 2019 release of the game. Unfortunately you have to own either the Deluxe Edition or the Collector’s Edition to be able to to this.
So if you have either of these versions, go to the main menu (Options on PS4 / Esc on PC / Menu on Xbox 1) Click on "Choose Audio" and scroll far down. This menu will give you the option to use the class soundtrack and the classic sound effects.
If you change your mind later and want to revert back, simply return to this menu and select the remaked soundtrack again. You can change it at any point while playing, so it's far from a permanent choice.