There are general rules for designing the electrical circuits. One of them is that you use only 90 degrees angles everywhere. So it's not common to place the elements at an angle 45 degrees. According to these general concepts CST Design doesn't allow you to arbitrarily rotate the elements in a circuit, only at an angle 90 degrees.
Why do you whant exactly 45 degrees? I believe it doesn't make a sense for the physics of your task.