Below are the three guaranteed methods to change the language. This method works for all versions of HOI4 (Steam, Microsoft Store, Game Pass).
(If you cannot find it, paste %USERPROFILE%\Documents\Paradox Interactive\Hearts of Iron IV\ into the address bar.) how to change language in hoi4
Restart HOI4. The interface should now be in your chosen language. Method 2: Steam Launch Options (Best for Steam Users) If editing the settings file doesn’t work (or resets each time you launch), you can force the language via Steam. Below are the three guaranteed methods to change