Working on multiple tilemaps at the same time

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Is it not possible to choose more than one active tilemap at Tile Pallete to work on multiple layers at the same time?

I don’t know if I understood your question. Why would you want to work on multiple layers?

You need to select the layer you will work to make it easy to you to build your game, if you were capable of editing more than one layer at the same time how would you know in which layer you draw your tilemap?

Tell me what you were trying to do, I guess this way it will be earier to help you.