Limit the number of injured troops displayed in the Army Management screen.
First choice would be to 8 of the least injured of each troop type.
If you had 10 spearfighter each with 1 point, 2 points, 3 points, ... to 9, points of injury, only 8 infantry with 1 point of injury would appear. In total 8 spearfighters with 1 point of injury would appear.
Second choice would be 8 of each level of injured troop of each type.
If you had 10 spearfighter each with 1 point, 2 points, 3 points, ... to 9, points of injury, only 8 infantry with 1 point of injury would appear. In total 72 spearfighters would appear; 8 with 1 point of injury, 8 with 2 points of injury, ... and 8 with 9 points of injury.