If you're new to the game, here's how to change the language.
Apex Legends: How to change language
On PS4 and Xbox One
If you're playing on console, changing your language setting is nice and simple.
Head into your settings menu, then change your language to your preferred dialect.
On PC, you'll need to change the settings in Origin. In your library, click Apex Legends and then the "gear" icon for settings.
In "Game Properties", head to "Advanced Launch Options" and then you can change your language.