The default Graphical User Interface for Redhat Enterprise Linux 7 server is Gnome. If from some reason you have decided to install KDE Desktop or to switch from a RHEL7's default GUI gnome to KDE this short tutorial will provide you with easy to follow steps.
This is a companion discussion topic for the original entry at https://linuxconfig.org/installation-of-kde-desktop-manager-on-rhel-7-linux-server