How to set focus follows mouse

[hput3]

You can find it in Settings under Window Manager.

To get there directly
Click Menu
Begin typing 'Window Manager' into the search bar
When you see the Window Manager choice offered, click on it.

Select the 'Focus' tab
Select 'Focus follows mouse' in Focus Model
and choose the 'Raise on Focus' options

First off, thanks for that.
Your explanation was so straight forward as to be a bit embarrassing.
Thanks again.