While using “Section” command, if I set “AssignProperties=ByInputObject”, output curves are added to the polysurface groups and I need to ungroup curves and objects. Also “GroupObjectBySectionPlane” variables is set to “No”. In Rhino 7, this command was working properly.
I attached my file, I just selected all polysurfaces and run “Section” command. Curves was able to be moved freely after the command produced section curves but after unselecting, when a curve is selected, polysurfaces are selected too.
I hope it is my fault and no extra work needed for your side.