I'm just a user, not a developer, but I don't understand your request.
At only one point in your flight will you be 1/4 through your flight plan, with 3/4 to go, so I don't understand that part. Do you mean that the moving map should be oriented such that 3/4 of the screen is showing where the plane is headed, and only 1/4 showing what you just flew past?
If so, then the app already does that. When you're sitting still and not moving, the map centers on your plane, so if you've only looked at the app while sitting on the ground, that's the view you've seen. Once the plane is flying, the app adjusts (based on your direction of flight, not what's in your flight plan) so that most of the screen is showing you what you're flying toward.
If that's not what you're asking for, could you please clarify your request?