When pushing play in editor, why dinos spawns in SmallIslandSubMaps, but not in TheIslandSubMaps ?
What’s the difference ?
I think they only work, regardless, if you load the entire map. Or rather, the persistent level needs to be loaded as that’s where the more crucial settings are located, such as below.
I really couldn’t be bothered to double check as it would take too long, but the main reason you’ll notice it on the SmallIsland is because all of the NPCSpawn Volumes pretty much overlap, so you’ll have about a hundred or so dinos within a minute or two on the level.
TheIsland may be set to, by default, disable the NPCSpawners while in the Editor, whereas the SmallIsland isn’t(I know this as I disable it everytime I load it so I can test without getting killed in seconds). There’s a check-box in the World Settings to enable/disable the spawners while PIE.
-WM
Thanks, it works now 
related question :
Why can I put a dino_Character_BP (ex Turtle_Character_BP) on TestMap and see it moving when simulating, but not on TheIsland ?
On TheIsland, when I simulate, I see the dino disapearing with just the vectors of pivot point visible. Again what’s the difference (not the Enable NPCSpawners option this time…) ?
I think I get it : it’s about draw distance. When in simulation mode, the player is far from the camera, and the dino near the camera (far from player) are not drawn. When I play at camera position, it works.