Found in  and  in the "Position > Vertical > by" section:
"This option is only available if you select "From Top" or "From Bottom"
(as character) in the Vertical box."
Main problem: "as character" has no meaning/relevance here.
"This option is only available when <menuitem>From top</menuitem> or <menuitem>From bottom</menuitem> is selected in the Vertical box."
Can't find the text suggested to be removed on the pages indicated.
(In reply to Olivier Hallot from comment #1)
> Can't find the text suggested to be removed on the pages indicated.
This issue got addressed in:
will closed as "fixed".