Map System

[Niwashi]

Checked System Config... is it Character Lighting that I adjust?

System Configuration -> Display Settings -> Gamma Correction
is the one that can brighten or darken the entire screen.
For a brightly lit room like yours, I'd set it (and perhaps the Character Lighting one as well) to maximum.

(Or is that setting platform specific? I know PS3 and PS4 have it. I expect how it's accomplished behind the scenes would be different between consoles and PCs, but the desire to have such a setting would stay the same, so I've always assumed it was offered on any of them.)