In Writer 2013, you can change page margins for your document. Open the Page Layout tab and click the Margins icon. The Page Setup dialogue box will open. Select the Margins tab as below：
Figure 1 The Margins tab
You can set the margins here:
Step 1 Enter the Top, Bottom, Left, and Right text box to set the value of the margins.
Step 2 In the Orientation section, select the paper orientation, you can choose either the Portrait or the Landscape option. The default paper orientation is Portrait.
Step 3 In the Pages section, you can choose Normal, Book fold or Reverse Book Fold options for the multi-page mode.
Step 4 Select the application style in the Apply to drop-down list.
Step 5 Click the OK button to complete the operation.