UE: Synchronizing Exposure Across Multiple Screens
The very, very simplest method is
Create a new LocalPlayer and override the function

The principle here is to set StereoPass to eSSP_SECONDARY for all players other than the primary player
During rendering, the system will then treat them as the left and right eyes of the same pair and use the same data to calculate exposure. This synchronization is absolute, with no deviation
In version 5.3.2, this code is in the FSceneView constructor

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