Hello @weiluo
This can be solved with a simple "education" on the user side on how soft keyboard works, to call in the Soft Keyboard by holding the Windows key and then spacebar (to rotate input method) or in touch screen by tapping the keyboard icon on the bar. This will bring the keyboard when no input focus is detected.
This are "modern" controls that we should get used in the near future as part of computer usage.
Best regards,