When in layout mode of wplayFullLayout with wppInteractiveSelectionMarker enabled, moving the markers works well. However, when the layout mode is wplayShowManualPageBreaks it does not work at all other than showing the markers.
For example, in wplayFullLayout when I move the mouse over a selection marker, it changes color (blue to light blue, then orange when dragging). But in wplayShowManualPageBreaks it doesn't change color at all and you cannot drag them. If you try, they just disappear.
WPRichText 9.2.001
Delphi 10.4.1