Survivor should have a way to see generators on in-doors map
On outdoors maps you can always see the antenas if you pay enough attention but on in-doors map there's no way to tell unless you actually find them,let the survivors see the generators aura for 5 seconds at the start of the trial in any indoor maps.
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It's obviously hard to predict you're getting an indoor map, unless you personally bring a map offering, but if this is routinely an issue perhaps try running something like Detectives Hunch. Not only will it show you where those pesky NOED totems are, it reveals all the gens too. 👍️
You do, if theres a generator inside a room on Lerys you can see lights flickering inside and outside the room
There are subtle clues to the location of generators on indoor maps.
On Lérys Memorial Institute, lights flicker in the presence of an incomplete generator.
On The Game, doors are closed when a nearby generator isn't complete.
On Hawkins... I honestly got nothing. The map itself is pretty linear and the gens spawn in roughly the same places though, so if you can memorize them, you won't have a problem.
Recognize these, and you'll find gens. Or randomly wander about, using perks like Deja Vu or Detective's Hunch to find them. Either works.