The word "Xuanze" (选择) implies freedom of choice. Unlike the binary "Uninstall/Reinstall" offered by EA, this tool gives you a drop-down menu of 12+ languages. You select, click "Save," and launch the game.
3DMGAME. (2021). The Sims 4 language selector: Xuanze tools [Software]. CS.RIN.RU community. 3DMGAME-The-Sims-4-Language-Selector-Xuanze-Tools
By default, The Sims 4 language is determined by your EA App or Steam client settings. To change it, you normally have to uninstall the game, change your platform’s language, and re-download 30+ GB of data. The 3DMGAME tool bypasses this by directly modifying configuration files and registry keys on the fly, supporting all standard languages: The word "Xuanze" (选择) implies freedom of choice