If you are using a Mac system, there's a percent scaling box you can select in one of the print dialogs to scale the output from the layout and you can use this figure to fit your layout to the page.
In Windows systems:
Enter layout mode
Select your printer, page size (A4) and page orientation (Portrait or Landscape) from Print setup.
This places a pair of heavy dashed lines on your layout showing the limits of your printable area for the settings specified.
Move, resize the objects on your layout to "fit" to the left of the vertical dashed line. If you want your out put for a single record to fit on a single page, also resize your layout parts and move objects up until all are above any horizontal dashed line. Switch to Preview mode to check the results.