When we want to add say customer name to bank deposit slip, if you go to advanced filters the Insert/Modify is greyed out. You have to actually run the report and then insert/modify - show/hide fields.
Which does seem a little back to front.
I have also found that I have had to print a couple times to pick up and print the extra info I require.
This is the same if you want to find sales on a particular item. You have to run whole report before you go and change to item you want.
Old version, you could customise first, before ran/printed report.
Unless of course we are doing something wrong