The players will only see characters that their own characters can see.
It automatically activate/deactivate NPCs for the GM. You can still prevent that with a special status though (vision lock, eye status at the top of the list)

So, since I don't want to make a large explanation.
Can someone explain how this mod actually works?
Like, what the players will witness and what the GM can do with it?

Because I feel it's a good solution to hiding things in campaigns, but I also feel like deactivation will not allow me to control the npc's around the stage with the mass npc controls.
Henz, I have reservations about it's use, since I won't be able to make the maps come "alive".

Amazing mod, thank you. But sight statuses are bit messed up. For now it looks like this:
Better sight 1: +50
Better sight 2: +10
Better sight 3: +20
Better sight 4: +15
Better sight 5: +25

If you were to deactivate NPCs that are out of sight in story mode you would probably mess up a lot of scripts.
In GM Mode, the Game Master have to manage that manually and it can be a real pain on larger maps, hence why I made this mod.

From what I'm reading, it seems impossible to create a mod for the original campaign that disables (or make invisible) all NPC out of players' sight, right? I would love a mod like that.

Yup, that's what I found out. Thank you for this amazing mod!

@scopecondor Non-spotted NPCs are basically deactivated. If you want to possess them properly, re-activate them before.

It seems like the GM cannot control a NPC if it hasn't been spotted yet. Is there a way to make it so that players have their sight limited but not the GM?

Perfect. Exactly what i searched for.

Update : Deactivation now provide an invulnerability triggered from Osiris. It does not remove any statuses and prevent any damage.

"Fixed" the issue. The Deactivation does not provide invicibility anymore, so it does not remove statuses. However, you will need to provide yourself invicibility in case a deactivated NPC needs it.

Well it's not the mod itself that remove statuses, it's the deactivation of units. I had this in mind since some days and I'm working on it.

Any chance you could make a mod which just adds blindness without the visual effects? As this mod removes the emotes i assign to all NPCs. Blindness status effect works for my fighting arena but it does look strange lol.