Dear Community,
How do I change the language in Rocket League without having to change the entire Xbox language?
Unfortunately, this can't be done without having to change the system language.
Xbox
Press the guide button on your controller
Go to Settings
Choose System Preferences
Choose Console Settings
Choose your language and locale
Choose language
Choose your preferred language
https://support.rocketleague.com/hc/en-us/articles/360056072193-How-do-I-change-my-Language-in-Rocket-League