A standard septoplasty does not change the outward appearance of the nose. If there's deviation of the columella or base of the nose, a septoplasty may help.
Great question. Generally speaking a septal surgery is not designed to change the shape of the nose. The only exceptions to that would be in patients with repeated nasal trauma such as hockey players or boxers. In those patients I have found that the septum is typically completely calcified. if you straighten those "bony" septum the nose does tend to become a bit straighter. Additionally in a poorly performed septoplasty you may lose either tip support or develop a large perforation and saddle nose deformity. That is probably the most dreaded complication of a septal surgery, however in expert hands it is an exceptional rarity. An expertly performed septoplasty should not change the shape of the nose to any discernible degree. Hope this helps.