Global Illumination (GI) is one of the visualization effects that you can control. The exposure in your project should improve a lot just by turning on this feature. GI refers to a scene where the lighting is reflected around and on objects (indirect lighting). This feature provides secondary light beams, creating a pleasant and balanced exposure.

Configure the GI function in menu View | Advanced.

Left: No GI. Right: GI is on

Note that: Global Illumination doesn’t show in PhotoTuning renders. This article described which light settings affects your rendering.