You have to change the in game resolution.The graphics settings for both the film viewer and game are tied together and are not able to be set separately. (Though I wish it were)
You can do what you are asking. The graphics settings in-game control the film viewer graphics as well. So, fly in whatever resolution/graphic detail you want. Then when it's time to make a film, change these in game and they will show as such in film viewer. It works that way for me anyways (unless I'm fundamentally misunderstanding what you are asking).
Amazing you could actually recruit that much suck into one squad.