Feedback Qubes OS alpha with sys-gui

I restarted it but …

So now, I can login to Qubes OS with Xfce like the one before installing sys-gui, or using the new sys-gui xfce. So in the normal/old XFCE everything is working as usual and normally, but when I login to the sys-gui environment I just have as describe here and here only only dom0 and sys-gui with zero other of my Qubes. Do I need to do something else after that ?

As explaned here I would need to do the following command :

qubes-prefs default_guivm sys-gui

But nobody in the forum mentionned about it so I don’t know what to expect and what can I do to revert it

if I’m doing the qubes-prefs default_guivm sys-gui command, I can revert it with right ?

qubes-prefs default_guivm dom0