I don’t understand how to make this kind of lighting

Hello. This may be a newbie question, but I am developing a fan game based on Bendy and the Ink Machine. I don’t understand how to make this kind of lighting, I don’t know if the directional light is turned off. (I want my whole game to be in this color scheme) Please help me.
Below screenshots

Directional lights are mostly used for exteriors, like a forest scene. You can achieve something similar as the images you post by adjusting the ambience color (in lightning settings) and setting up some point lights or spotlights. Also, you can bake your lights to make it look more realistic and at the same time saving resources. Keep in mind that also, baking too much lights can be a bad idea, since baked lights become lightmaps textures, and the light engine have to import all of those textures and the original textures, basically duplicating the textures.

You can look for more info on the official documentation and also YouTube.