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Ensure that the language assigned to the SetLanguage function matches exactly with the active languages checked in the . If a language is not enabled for runtime, the system will ignore the button press.
Even though the software interface is Chinese-only in its default form, there are still settings to adjust the language environment.
This is a software limitation rather than a configurable setting. The interface language cannot be changed to English. Your only workaround is to use translation apps like Google Translate on your phone to translate screen captures for navigation. The good news is that your compiled HMI projects can still be multilingual, as detailed in the "Runtime Language Switching" section above.
Use the built-in system function: "SwitchLanguage" under "System" → "SetLanguage" (available in WinCC Flexible Smart V3 SP2+).