However: the questioner wanted to know about TrueOS, not about FreeBSD. The desktop with TrueOS is significantly different to the desktop with FreeBSD. There is extra desktop stuff that comes in the box with TrueOS. And the desktop stuff is done somewhat differently.
With some FreeBSD-derived operating systems such as GhostBSD one gets "flavours" of the operating system according to the desktop environment, like "GhostBSD MATE" and "GhostBSD XFCE". With TrueOS, there aren't such multiple "flavours". Rather, PCDM allows one to select from multiple desktop environments at login time, and the desktop environments are available side by side in a single "flavour" of the "desktop" operating system. TrueOS is in fact "flavoured" as "desktop" versus "server", rather than as "MATE" versus "XFCE" versus whatever.
There are a number of "TrueOS-own" tools that are added to those desktops, as well, including (for examples) the Life Preserver, the PC-BSD Control Panel, AppCafe, and the System Updater.