Lightroom - Fixing A Wonky Horizon

There are two ways to straighten a crooked horizon in the Crop Overlay Tool.

Method 1

Step 1 - Open the Crop Overlay Tool, either from its icon or pressing the keyboard shortcode R.

Step 2 - Down the left-hand side is a tool called the Straighten Tool (illustrated here). Click the icon and drag a line across your image where it should be level. Lightroom then makes the correction for you.

Method 2

Open the Crop Overlay Tool and use the grab handles around your image to drag the image into the correct alignment.