How do I completely remove xfce without breaking anything

[gray beacon]

I don't want to break something again

[shrewd plover]

run sudo pacman -Rcns xfce4

can check it's dependencies

before pressing Y

look at what they do

You can also post the result here

If there isn't anything that's important you can obviously remove the package and all of it's dependencies

If you don't have any DE/VMs aside from xfce you'll be stuck in a login manager/tty screen

[gray beacon]

I'm on Ubuntu

[shrewd plover]

Okay my bad

Use sudo apt remove xfce4 instead

And check the dependencies

you can also use purge too which removes config files etc

Also from what I remember apt should have a way of uninstalling unusused dependencies aswell

Generally speaking uninstalling an DE shouldn't break your system

but you never know

You can also always make a snapshot

[uneven gyro]

it absolutely can because in some specific situations (uncommon but possible on different distros) it can remove a bunch of dependencies which in turn have dependencies which when removed can cause issues

[shrewd plover]

That is why I told them to check the dependencies one by one

Only way to be sure

And used "should" because it's uncommon