If you cannot input anything in the search bar/Internet Explorer when your system is in Win10 RS5 17763 safe mode or safe mode with networking, but you experience no such issue in safe mode with Command Prompt, please be aware that this is expected behavior.
This feature is not supported in Win10 RS5 17763 version but should you require this then an upgrade of the OS to Win10 19H1 18362.30 will make the keyboard fully function in safe mode as needed.
Not applicable.