AstralLein
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Hello.
I wanted to give some advice: to play on a map with all factions (i.e., when playing as Elves, the Elven music plays, quests are displayed, and all heroes develop), you need to check the box only for single-player in the "Global" section of the editor and choose the faction you will be playing as. (It's better not to enable multiplayer if you're playing alone). If you want to allow players to play as 3 factions in single-player, it's better to create separate maps.
Actually, it's more the other way around; the map is designed for multiplayer. But thanks anyway.