I can't change race in a custom game

I can't change race in a custom game - Free stock photo of 3d, adult, amusement

When I create a random map in Custom game menu, I can not change the race when I play on this map.

Any ideas why?

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Nas - I Can (Official HD Video)

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Images: Tima Miroshnichenko, Pixabay, Pixabay, Rangga Aditya Armien