Hello Kayece, thank you for the advice you gave, I really appreciate it.
So I have tried the method you gave, but it seems that I need to get straight here,
The screenshot you gave is "On-Screen Keyboard" while what I mean is "Touch Keyboard". actually,
I'm not sure these two keyboards are two different features, but the fact that they have their own settings confuses me.
For the on-screen keyboard, I have no problem with it, the sound works fine. But for the Touch Keyboard, I don't understand to turn on the sound effects.
If you have any other way, it will be very helpful, thank you very much.
*this is that touch keyboard i mean