Once I clicked on the 1st photo and see what you're speaking about, it definite is a pop up fixed head. Kind of hard to see what brand of head or type of nozzle (quarter, half, three-quarter, or full) tho.
Best option is to replace the nozzle on it to something that is about 180 degrees. Chances are what is there right now is probably a larger radius and thus its shooting at the plants as well as the pad behind it.
As for distance, there is usually a screw on top that you can use to adjust the distance.