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@cadffm wrote:

.... >"but the appearance remains unchanged"

You changed the array layer, not the layer of objects inside array.

Try this:

Create an object on Layer0, set color to byblock or bylayer, create an array. ....

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To expand on that a little:  Elements in an Array "object" are like elements in a Block definition.  The Array, just like the Block, can be on one Layer, but the pieces in it can be on another Layer.  If the pieces are on Layer "0," then they will take on the properties of the Layer that the Array [or Block] is on.

Kent Cooper, AIA