This tutorial by user Linux Help will show you how to get an XFCE desktop environment set up in FreeBSD. Follow the link below for the full set of instructions, or watch the video below:

To install XFCE desktop in FreeBSD

In this article we will learn how to install XFCE desktop in FreeBSD. FreeBSD is a UNIX-like operating system used by companies, computer professionals, Internet Service Providers, researchers, students and home users.

Installation of XFCE

First start installing “xorg” to install XFCE.

https://www.linuxhelp.com/how-to-install-xfce-desktop-in-freebsd/