Many languages use a left-to-right script, which calls for a page binding on the left edge. However, binding on the right edge is preferable for right-to-left scripts such Arabic and Hebrew and several East Asian scripts.
The Page Binding of a document can be updated directly from PDF Viewer 3.6 and newer, for users with an active Pro subscription. The changes made to this property will be saved to the document and will have an effect on other PDF readers.
To edit the Page Binding of a document using PDF Viewer:
Open the Document Info screen.
Tap "Edit" on the lower-right corner.
Select your desired Page Binding setting, between Left Edge and Right Edge.
Tap "Done" to save the selection to the document.