Since you are working within a 3D space, there should be areas where you can shift your gaze that would be the equivalent of that window and are not full brightness.
As to having a drink or snack or other activities, the crown control lets you dial in more or less of the real world around you and let you choose the degree of blending.
As to having a drink or snack or other activities, the crown control lets you dial in more or less of the real world around you and let you choose the degree of blending.