When not in a PPV, the exposure overbrightens things by default and at closer viewing distances. How are the PPVs set up currently? as in, where are they positioned, what is the exposure set at, and what are the scale values? Blend Radius is a setting to decrease or increase the transition between two overlapping or nearby PPVs. So, if one PPV is inside another (such as the interior PPV is inside the larger, exterior PPV), then a Blend Radius of 100 would transition from the interior look to the exterior look across 100 cm around the inside PPV…when moving the camera from inside to outside. I tried something to solve your problem in a project I use for testing, and to get somewhat the effect you’re trying for, I created two PPVs. One is immediately surrounding the interior of a building, and has Auto Exposure set to Histogram mode (Compensation value 0, Min 2, Max 2), and the other is outside the building at about 40-60 cm (Unreal Units) from the interior on one side. It’s set to Basic mode (Compensation value 1, Min 2, Max 2), everything else default in exposure, and has RT fully disabled. When I go outside of those PPVs with the camera and look at the building within about 2000 from it, the over-brightening happens. It’s a transition from lit to looking like it has a giant spotlight on it. The reason I set the Min and Max values the same is to avoid that obvious transition and keep the exposure constant in the PPVs. It’s simply that the outside PPV is a bit lighter inside it and the interior PPV is a bit darker when inside it. A better approach would require skylight and / or directional light to be adjustable in a PPV, and for a PPV to be capable of referencing the area outside it along with changing properties of the target reference area if the camera is inside the source PPV. It could potentially be programmed with blueprints, but I don’t know how to do it. Perhaps by subtracting the volume space that the PPV contains from the whole scene, or a larger PPV surrounding the source one, and generating a reference to the result to target it for adjusting via the properties within the source PPV.