Help - Arranging the layers in 2D when transferring to a new collection

I have started drawing a NFT collection in blender coming from adobe illustrator as I want to learn blender. I have drawn my 2D drawing all in 1 collection under one grease pencil and placing all different traits for my NFT on different layers. I then watched a video of how I can randomise my Traits through blender and realised I need to have all my different traits in different Collections which means I can turn them on and off at the flick of a switch. after copy and pasting to a new Collection I am noticing that they size different but not only that I cant change the arrangement from behing to
infront meaning to change the heirachy of the layers to appear in the order I need. How do I do this?

maybe tag post as grease pencil to get the attention of a grease pencil user

also screenshots of the problem help a lot

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