VNC access via non-root user

I'm using the realvnc5.3.2. For non-root users to access the Linux desktop through VNC, the network of the vast number of articles are said to configure/etc/sysconfig/vncservers. But after installing realvnc5.3.2, there is no such file. Note, however, that after installing realvnc5.3.2, the VNC icon appears at the top right of the Linux (the author is using the Red Hat Enterprise) Desktop (see circled section), right-click the icon, choose the second option, select "User & Permissions ", then select" Add "and enter the user name. This user name must be a Linux user or the system will not be accessible.

There is a problem: I built a normal user vncuser under Linux, the password is 123456, I can connect to the remote Linux desktop through the vncviewer on Windows, I still see the root user, I do not know why? If you can connect to the Remote Desktop is the real ordinary user vncuser it?

VNC access via non-root user