You can straighten a crooked photo in Develop mode by rotating the photo at a custom angle.
You can save your settings as a preset for future use.
To Correct a Crooked Photo:
You can right-click a slider to reset to the default value.
Click the Show Grid button  to display a grid over your image. This tool is useful when fixing alignment in your images. When the grid is not activated, it is gray
 to display a grid over your image. This tool is useful when fixing alignment in your images. When the grid is not activated, it is gray  .
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Rotate Options
| 90 degrees to the left 
                         | Rotates image 90 degrees to the left. | 
| 90 degrees to the right 
                         | Rotates image 90 degrees to the right. | 
Straighten Options
| Slider | Adjusts the horizontal angle of the image. Move the slider left or right until the image appears straightened. | 
| -5 Degrees left 
                         | Adjusts the image -5 degrees to the left. | 
| +5 Degrees right 
                         | Adjusts the image +5 degrees to the right. | 
| Straighten tool 
                         | Straightens the image. Use your cursor to draw a line along the crooked horizon. Release the cursor to automatically straighten the horizon. |