I'm really new at this so sorry if these seems like a really basic question. But how do I change the fade group on construction roofs so they don't all fade at the same time?

When I try to change the fade group manually, the roofs don't fade when entering the building.

[img]https://image.prntscr.com/image/P2by2FUMT6OoO16cYDwspA.png[/img]


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