Lxde-pi settings/layout is gone - how can I set it back?

I just installed sonic-pi on my uConsole but after that all the settings for the layout, shortcuts, login manager were gone. Better said: No more respected/used. Everything is now just lxde.

I don’t know why one program changes everything, I never experienced this before. But now I want to set it back to normal.

I use the basic image from clockwork pi delivered with the uConsole in this case.

  1. Where and how can I change the login manager back to the one with the raspberry pi logo?
  2. How can I activate lxde-pi instead of lxde overall? In sudo update-alternatives --config x-session-manager it’s not (no more?) listed.
  3. Is there an overall settings to use the settings with lxde-pi* for lxpanel, lxsessions, …? Or how can I change the lx… parts in .config right?

Thank you very much.
I’d not only like to set everything back but I also want to know more about these settings on the uConsole.