Xfce is a lightweight desktop environment (DE) that comes with several distro flavors/spins such as Xubuntu.
I find it lacking from the outset without the Whisker menu, but Manjaro and perhaps Xubuntu and other distros install that by default.
I don't recommend Xfce for the following reason:
When I get into low-memory situations with Xfce it normally has a hard freeze where I can't click anything. I know nohang (See that link for info on other DEs that froze as well) basically solved my low-memory freezes with Xfce. This problem has gone on from approximately 2016-2022 until I gave up on Xfce and started switching my customers to MATE with some tweaks.