The Dramm ColorStorm Oscillating Sprinkler has two adjustment: a sliding adjuster for the width of the spray pattern, and a knob that adjusts the strength and distance of the water spray. You can adjust the sprinkler to spray more narrowly, but you will want to place it in the center of the area you are watering. If you need a sprinkler that will stop at the center, you may want to consider the Gilmour Oscillating Sprinkler which has a more exact adjustment for the angle of spray.
We recommend contacting Dramm consumer support directly for troubleshooting assistance with your Dramm ColorStorm Oscillating Sprinkler at (920) 684-0227, or via their website's contact page here.
We apologize but we are not as proficient at troubleshooting the Dramm ColorStorm Oscillating Sprinkler as the manufacturer would be as we actually do not carry that unit anymore. You can contact the Dramm Coporation directly for assistance at 920-684-0227.