You can use both the Document Viewer and the Fields pane to move around the validation fields on a document.

In the Fields pane, you can use either your keyboard or your mouse to move between fields.

As you move from field to field in the Fields pane, using your mouse or keyboard, the corresponding field is brought into automatic focus on the image in Document Viewer, regardless of magnification level.

Using the mouse requires you to click a field to edit it.

If you leave the field without pressing Enter, its contents are shown in italic, indicating that the field is not verified.