Purple points not shown after moving the plane

Is there a reason why the purple points ( img 3) don’t appear when I move the coordinates of the sketch and plane ( img 2). The purple points of the middle plane are shown before moving the plane (img 1)


They only show if there is an intersection between the sketch, and the plane selected to sketch on, in your case, the front plane. If you move the sketch away from it, you might not have any points where these cross eachother, therefore no intersection points are shown.