How to set the remote connection screen resolution for a Raspberry Pi 4?

When accessing your Raspberry Pi 4 remotely via a VNC viewer or Teamviewer for the first time it is very likely the screen size shown has a very small resolution (320×200) and hence is unusable. How to set the remote connection screen resolution for a Raspberry Pi 4?

Perform the following steps:

1. Connect to your Raspberry Pi via a SSH connection (for example via Windows by using PuTTY) and login.
2. Execute the following command:

   sudo nano /boot/config.txt

   This will open the nano file editor with the Raspberry Pi 4 OS configuration file.

3. Find the following 5 lines and if uncomment these if they are commented:

   #framebuffer_width=1280
   #framebuffer_height=720
   
   #hdmi_force_hotplug=1
   
   #hdmi_group=1
   #hdmi_mode=1
   

4. Set the framebuffer_width and framebuffer_height to your required resolution
5. Set hdmi_group and hdmi_mode settings to the values shown below:

   hdmi_group=2
   hdmi_mode=16

6. Ensure that the following two settings are commented by placing a # in front of them.

   # Enable DRM VC4 V3D driver
   dtoverlay=vc4-kms-v3d
   max_framebuffers=2
   

7. After we complete all the changes, press Ctrl+O to write the changes, and then press Ctrl+X to exit.
8. Reboot the Raspberry Pi 4 by entering the command:

   sudo reboot

When connected again via VNC viewer or Teamviewer the resolution should be the same as set above.