You should be able to look anywhere around the point to see suspended fish. Over a soft bottom, the fish returns should leap out at you (bright white spot), whereas over a hard bottom, the fish itself may not be 100% obvious….although the shadows from the fish will be very easy to see.
Hope that helps!
Here are a few examples of suspended fish. Look for the bright white fish returns and the dark sonar shadows.
One thing that will help that Jason didn’t mention is the screen contrast. If your not seeing the level of detail you need, adjust the screen contrast. Otherwise, Jason has it all summed up.
If you have shallow water on one side of the boat and very deep water on the other (you are traveling parallel to the break), sensitivity setting might also need adjustments… Depending on bottom content, depth, etc, the shallow side might seem very bright (white) while the deep side might appear darker, depending on how deep the water gets on that side. Also, depending on the steepness of the break and boat position when traveling parallel to the break, it could be possible to “miss” parts of the deeper water/structure due to the sonar being blocked by the shallower structure… It would have to be a pretty steep break, though, with the boat positioned just right (or wrong, I guess).
If you were to travel perpendicular to the drop (coming from deep and going shallow or vice versa), it will give you another perspective on the underwater situation. You won’t “miss” anything with the sonar when you attack the structure from various angles (if necessary due to the steep breaks). 
When I change depths rapidly, I generally find myself adjusting the sensitivity somewhat so the screen isn’t too white or too dark.
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