Vnc won't work without jetson connected to monitor

Robotics & Edge Computing Jetson Systems Jetson Nano
3

The L4T-README volume will mount on the other computer, including files such as README-vnc.txt.

This readme file has below content.

Setting the Desktop Resolution

The desktop resolution is typically determined by the capabilities of the
display that is attached to Jetson. If no display is attached, a default
resolution of 640x480 is selected. To use a different resolution, edit
/etc/X11/xorg.conf and append the following lines:

Section "Screen"
   Identifier    "Default Screen"
   Monitor       "Configured Monitor"
   Device        "Tegra0"
   SubSection "Display"
       Depth    24
       Virtual 1280 800 # Modify the resolution by editing these values
   EndSubSection
EndSection