2.40a subsurf question

hey i just dl’d 2.4 and i need to know how to make the “optimal” selection that would show where the verticies after the subsurf like in 2.37.

there is an optimal button but it still showd the verticies in their original position. and it shows the outline of the subsurfed wireframe.

sorry if this makes no sense whatsoever, but i cant explain it any better

Add Cube, Add Modifier-Subsurf, make sure the left-hand 4 buttons in the subsurf tab are on. Toggle Optimal and see it works.

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Ah i see thnx man