Add a page counter
A page counter would be fine. As of now the only way to know where exactly you are on a document is to open the thumbnail feature. If the page number were displayed (maybe as an in/out option) it would save us a good deal of time.
John Date commented
Yes! And this should update as pages are moved. Also, a last edited time stamp (both of these could be displayed in a low-key fashion - like a grayed watermark or something). The usefulness would be substantial, from sorting for review, to finding your most recent notebook edit.
Good Notes is very smart to stay with the metaphorical concept of paged notebooks. But this form's a need to navigate in a more metaphorical way - page numbers.