You are looking for "sabayon". From its description:
Sabayon is a tool to help sysadmins and user change and maintain the default behaviour of the
GNOME desktop. This package contains the graphical tools which a sysadmin use to manage Sabayon profiles.
Sabayon it is a standard utility in RHEL, currently on version 2.12.4.
If it is not installed, run "yum install sabayon sabayon-apply" to install the two packages needed.
PS: links to the project and tutorial: