My World Builder Map does not show up

[DAS]

I created a map using WorldBuilder for single-player. However, when I try to play the map by going to Single Player > Create New Game and selecting the map, the map I created doesn't appear at all. I've looked for related resources, but all of them are outdated and not helpful. Please help me

[Rift]

IIRC, I think the map is under "add ons" or "additional content". Wherever the DLCs and Mods are that you can toggle on and off.

Edit: Here's an old discussion about it...
https://steamcommunity.com/app/289070/discussions/3/3267933887521146106/

[jmerry82]

When you create a map and set it up properly, it shows up as a new mod ... but in my experience, you have to quit and restart the game in order for it to actually be available. That's needed to refresh the mod management menu.