Margins are standard, scaling is set to 1 page wide, there are only three columns. But the right margin does not show in either portrait or landscape orientation on SOME sheets of a 30+ sheet workbook. Others are fine. The problems pages' top ruler indicates that the last column only goes to, say, 9.5 of the 11-inch width.

I am working remotely and cannot use print preview, because Excel then looks for a printer forever and goes into a loop that I can only close by closing the program.

What am I missing here?