By default the width of the columns is the same as the sections of the
report in design view. However; you can go into Page Setup and change it
so you can make the report sections as wide as will fit on your paper and
enter a hard value for the width of the columns.
Using the above the Page Header/Footers and the Report Header/Footers can
span the full width of the page while the columns in the lower sections are
much narrower.