I have fit page to 1x1 yet Libre Calc fills narrow portion of an 8 1/2 x ll page. How to have document fill all?

How to resize calc document to fill full sheet of an 8 1/2 x 11 paper?

Just a reminder: have you checked Format>Page, Page tab to see the margins setting? Remember also that common printers have a non-printing area on the sheet edges for mechanical paper guiding.