Select , then go to the General (or Language ) tab.
If you are chasing in its truest sense—meaning the highest fidelity experience possible—consider these advanced tweaks after setting your language: wrc generations change language extra quality
If the language refuses to switch, the culprit is often "Partial Audio." By default, WRC Generations keeps the co-driver voice in the original language of the car or the region. To fix this: Select , then go to the General (or Language ) tab