You can't. According to the inquiry, the Ruins Library is a card strategy game produced and distributed by ProjectMoon, and the release date of the game is May 2020. According to the reaction of the players in the network, the voices of the characters in the game are rough and the music is a little scary, so many players want to change the sound of the game, but as of July 8, 2022, the game has not introduced the function of changing the sound, so they can only use the default sound and cannot change it.