Installing Lite Desktop Widget

[agedone]

I installed LinuxLite 3.0 on to a separate powered external hard drive connected to a Toshiba C660 laptop running Windows 10.
The Linuxlite was upgraded to 3.2 using Menu->System->Lite Software

Using info from the online manual ->customize:-
Menu->Settings->Sessions and Startup does not list the expected Lite Desktop Widget to tick.
(The expected Compton is also missing)

How do I add this to the list so the widget can be activated?

Thanks

Apologies for posting this in the wrong forum. New to Linux and Forums. Should have been in Software - Support >> Other