That made it! Thank you!

You can specify which shader should be used in Tileset / Materials & Shaders / Tileset Shader.

For Standard Render Pipeline:
If you are not using overlay then use Unlit / Texture shader.
If you are using overlay a complete Unlit shader is attached.

For URP / HDRP:
You can easily make your own Unlit shader using TilesetPBRShader graph as an example.

Or you can work around the light issue for any render pipeline in this way:
Remove all light from the scene.
Open Lighting Settings (Window / Rendering / Lighting).
Environment / Environment Lighting Source - Color.
Ambient Color - White.

I don't know if this is an obvious question but, I received the whole project already started and I'm not too familiar with Shader Editor. I need my map to look like Google Maps one, like unlit shader, white, clean.

Is there any tutorial or documentation of how to change the material settings so I can make that looking?

Thanks!