After you select the type of Panorama, Sphere, 180, Wide Angle or Vertical, look at your camera settings in bottom right corner. Tap "Format" and select "none" - You can also choose JPEG and RAW - Since your question indicates you only want the stitched photo this will not give you the finished JPEG plus a folder full of separate (26 in the case of sphere) photos in either Jpeg (default) or RAW (for higher resolution manual stitching on your PC) Trust me the stitched photo is there but your not finding it easily with the individual photos in the same location.
Later you can add the individual photos back from this menu if you like, but for now you will ONLY have the stitched product