Built-in shadow change or removal request

I have started building a continent map and chose the Fantasy Regional style. Unfortunately, the built-in shadows on many Fantasy Regional assets imply that the sun is shining from the NW. This works for my southern continents, but not for my northern continents. Can you please provide assets that have shadows implying that the sun is shining from a southern direction, perhaps SW? Or perhaps just remove the shadows from the assets such that we can use the "Shadow" option under "Stamps" to apply none, custom, layer, etc.? Thanks!