It comes down to the horse having scope, being well schooled and knowing how to jump each question, and down to the rider and the effectiveness of their aids.
How does your horse know how to clear an oxer and jump across as well as up and over? From a distance out the horse can clearly see the jump, it's only when they get 4-6 strides away that it drops out of their view, and by that point if you're riding upper levels your horse will easily know where it needs to take off and how far it needs to jump across. If your horse has routinely schooled cross country up through the levels it will have encountered jumps with both height and width and will already know how to jump said jump. In the early stages of learning to jump, once a horse has mastered the basics of adjustability, steering, etc. over smaller jumps, one thing a previous trainer liked to do was to set up a jump that was mostly width with very little height, to teach a horse how to jump across something.
If a horse and rider pair have progressed to those types of cross country fences where spread is just as challenging as height, then both should know how to jump, what I think is, a relatively straight forward question like a table jump.
"Always be yourself. Unless you can be a unicorn. Then, always be a unicorn."