When Access displays a report or a form in Design view, it divides the report or form into sections, individual parts that control what elements appear and how they are formatted.
Each section has a selector , a box to the left of its heading, that you can click to select the section. Any formatting changes you make then affect just that section. Clicking the selector in the upper-left corner selects the entire report or form.
Header and footer sections come in pairs. Headers in a report display text at the top of each page or at the top of the report. Footers appear at the bottom of the page. Headers and footers can also appear at the start and end of records you have grouped together. As with other sections in a report, you can add controls to headers and footers that include text, expressions, page numbers, and date and time information.