Форуми / Cotonti / Extensions / Pagelist plugin, how does offset work?

I am trying to add some additional website features and for that I am using the pagelist plugin: https://www.cotonti.com/extensions/navigation-structure/pagelist

It comes with an "offset" function but I am a bit confused what it actually does.
I am adding it but the output of the pagelist actually makes me wonder what it does. Cause the output is not what I expected.

I expect the offset to mean to not show the latest xx number of pages, based on pageID? Or what? I do not get it :)