Can I increase the max resolution on Windows?

Hi folks,

I installed VNC server on Windows 2019 running on an AWS EC2 instance.
Here is what I have done:

1. RDP into the EC2 instance using Local Admin account.
2. Install TightVNC as service and set up admin password.
3. Use VNC Viewer from Mac to connect to the VNC Server.

Almost everything works.  I am able to see the session and change the
resolution by right-clicking the desktop and go to Display Settings.
However, the max resolution is 1920*1080.  If I use RDP the resolution will
follow my Mac resolution (4K).

The VNC resolution is very essential to my following work and I need to set
it above 1920*1080.  Could anyone please suggest how I can fix this?
Thanks,

-- 
Shan Huang

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