STEP 1
 From the Library or Develop view, Press ‘R’ to activate crop mode
 STEP 2
 Press ‘X’ to change the crop aspect ration from portrait to landscape or landscape to portrait.
 STEP 3
 Press ‘Enter’ to commit the crop.
 STEP 4
 Export your file.
 STEP 5 (optional)
 You may want to reset it back to original after.  Just press the ‘Reset’ button so the original aspect ratio shows in the library.



