Try using the below
FlagVar=If(Count([Req ID]) In ([SectionDimension])<1 Or IsNull(Count([Req ID]) In ([SectionDimension])) ;"Hide";"Show")
Select the section and apply filter of FlagVar=Show
Try using the below
FlagVar=If(Count([Req ID]) In ([SectionDimension])<1 Or IsNull(Count([Req ID]) In ([SectionDimension])) ;"Hide";"Show")
Select the section and apply filter of FlagVar=Show