If I understand correctly your request, to only show the items on a current page? Then, easier to use FvwmButtons. I am using two buttons… one to show the current page and another all pages. In the screenshot, the two buttons (CurW / AllW) are on the right side above the pager. Here below is the config.
Module FvwmButtons WinSwitchButtons
DestroyModuleConfig WinSwitchButtons: *
*WinSwitchButtons: Fore #ffffff
*WinSwitchButtons: Back #2b4e5e
*WinSwitchButtons: Geometry 100x30-0+150
*WinSwitchButtons: Frame 0
*WinSwitchButtons: Rows 1
*WinSwitchButtons: BoxSize smart
*WinSwitchButtons: Font "xft:Sans:size=10:antialias=True"
*WinSwitchButtons: Padding 2 2
*WinSwitchButtons: (1x1, Title CurW, Action(Mouse 1) WindowList (CurrentPage) Root c c )
*WinSwitchButtons: (1x1, Title AllW, Back #faa46e, Fore #000000, Action(Mouse 1) WindowList Root c c)
Style WinSwitchButtons !Borders, !Title, WindowListSkip, Sticky
In general try to give replies that answer the question at hand, neither of your replies seem to do that. WindowList is not FvwmIconMan, and the question was about specific page not current page.
Anyways, checking out the FvwmIconMan man page, I don’t see any option that makes this possible, the Resolution option seems to only allow page or !page, but not allow you to state a specific page to show. And the Show and DontShow options seem to only match patterns from the class/resource/title/icon and not the page either.
So this appears to be not possible at the time, but might be a nice feature request to extend the Resolution option to allow one to specify which screen/page/desk a manager shows vs just current or not current. Putting in a feature request at https://github.com/fvwmorg/fvwm3 might get someone to extend this feature (or add a new one).