The location of the cabin air filter in a Ford Bronco depends on the model year. There's no single universal location. To find it, you'll need to consult your owner's manual. It will have a diagram and instructions specific to your Bronco's year and trim level.
Alternatively, you can search online using a combination of "Ford Bronco [Your Year] cabin air filter location" or "Ford Bronco [Your Year] cabin filter replacement". Many videos and articles show the process for specific model years.