VNC server full screen display is too small

On a centOS 7 remote server I have installed tigervnc. On Windows the viewer I am using is RealVNC Viewer. The configuration at /etc/systemd/system/vncserver@\:1.service

[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target

 

[Service]
Type=forking
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/sbin/runuser -l root -c "/usr/bin/vncserver -geometry 1920x1080"
PIDFile=/root/.vnc/%H%i.pid
ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'

 

[Install]
WantedBy=multi-user.target

The configuration at /root/.vnc/config

## Supported server options to pass to vncserver upon invocation can be listed
## in this file. See the following manpages for more: vncserver(1) Xvnc(1).
## Several common ones are shown below. Uncomment and modify to your liking.
##
# securitytypes=vncauth,tlsvnc
# desktop=sandbox
geometry=1980x1080
# localhost
# alwaysshared

When I connect to the server, the display is not what I expected. It's simply too small to use. I have tried changing the scaling but that didn't help. The scaling would help but the remote display is not in the center of the screen. So when I changed the scaling to 200%, it becomes "hidden".