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