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Click the FILE option from the Menu bar and select PAGE SETUP from the drop down menu.
Or click on PAGE LAYOUT tab of Standard toolbar and click on the bottom right corner of PAGE SETUP option.
Click on the tab PAPER SIZE.
Enter the width and height of the paper in the WIDTH and HEIGHT text boxes.
Click OK.
Or click on the Size icon at the mid of the Page Setup option from the PAGE LAYOUT tab and select the size.