Vectric Customer

Hi All,
I am trying to reduce a model that has several layers (the nickel bank from Vectric. Two layers are models and one is a vector, is there a way to reduce the entire bunch all at once? I have tried using transform objects but it only took one layer at once...
help plz

Make sure all layers are on and then select everything. Under Transform Objects open the box mark with the arrow in the picture, where you can resize. Make sure the Link XY box is checked.