padonkoff
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You can change this in the settings tree. These are advanced map options; look for the "Map Properties Tree" button, which is next to "Map Properties," where you were trying to make changes before. Then, in the tree, find the "players" section, select the desired profile, and experiment. I think you'll figure it out from there.
Unfortunately, nothing works. I even took a map where all the race and starting hero selection windows for the AI are active in the game and compared the settings in the "Map Properties-players" section, but I couldn't find any differences...