This is in contrast to other Casio calculator models or electronic devices, where language can be an adjustable setting. For example, some support pages for other Casio products mention a Language setting within a "Set Up" menu. However, these references are for different models and do not apply to the fx-50FH II.

https://support.casio.com/storage/en/manual/pdf/004/fx-50FH_II_EN.pdf

Select your preferred language for the PDF documentation (English and Chinese are widely available for this specific model).