When printing a spreadsheet which is 3 pages wide by 66 long; page 5 &6, 8&9,
11 &12 etc all have an extra line centred horizontally and vertically across
the three repeated columns at the beginning of these pages

It seems that this line indicates that the spreadsheet coninues over
multiple pages wide (although this could be incorrect)

Any suggestions as to how to turn this off?

Thanks