Binding

Checks if the PDF is bound on the left or on the right.

Left-edge or right-edge binding affects the way the pages of a PDF document are arranged when they are viewed in the Continuous-Facing page layout.

The binding should be set to match the reading direction of the text:

Left-edge for text read from left to right. Use this setting for documents intended for a Western audience.
Right-edge for text read from right to left.

Possible fixes

If you are searching for left-edge binding, you can immediately change it into right-edge binding and vice versa.