VNC headless mode on Raspberry Pi low remote desktop resolution

Connecting to Raspberry Pi without keyboard and monitor connected via VNC viewer, but default display resolution is 640x480, which is too small and could not be scaled up.

After google for a while, link below provide the solution to change VNC screen solution:

https://www.realvnc.com/en/connect/docs/raspberry-pi.html

The term is headless and  To change the resolution, run the command sudo raspi-config, navigate to Advanced Options > Resolution, and choose an option. HDMI mode: Force

Thanks realvnc, and I learned something new.