18.04 desktop

I have an old Pentium 2 duo computer that had 16.04 on it I upgraded to 18.04.1 & like the new desktop.
My latest computer is an Intel I686 I7 I installed 16.04 on then upgraded to 18.04 but I still have the same desktop as 16.04 & can not move the launcher to the bottom which I could in 16.04
Any clues on how to fix this please.
Sorry if I have posted this elsewhere,

Hi @peteraj, you probably missed the notification when you registered that this site is somewhere where support requests should be placed. Please take a look at the official support channels listed at https://community.ubuntu.com/t/finding-help/712

My personal preference would be the Ubuntu Forums but other sites are of course available.