Hello. Jeff here from Tennessee. I am new with eBooks and Calibre and I have a question that I need help with. Referencing the image below, I have lost the left "number sequence" column (I was unsure what to call it, it appears like an Excel row number) in Calibre. This was unintentional on my part and I would like to restore my numbers. Any assistance would be greatly appreciated. Many thanks in advance!
