I have added vncserver :1 into by default shell(bashrc) script and able to make this work somehow. however when i vncviewer to the pi4, it says vncserver is already running. the reason i selected this approach to add this into my bash startup script is due to failed to start the vnc at boot by following the below steps).
https://learn.adafruit.com/adafruit-ras ... at-startup