I believe that the devs may have made a slight error while designing the 757. When behind another 757, you can see over the plane’s fuselage. But when you go to side view, it shows the cockpit isn’t higher than the fuselage and you wouldn’t be able to see over it. I was flying with my friends earlier when I noticed this.
The 757 is a really old model so there might be some errors. I’ve been really hoping for a 757 rework but everyone seems more interested in bringing in the MD-80 , A350 and other aircraft that are not in the game yet so it will be a while until the devs start reworking the older models