You can increase the width and height of your pages within your Webstarts website. Start by clicking the Increase Size icon located on the right side of the toolbar. From the drop down, select the appropriate width from the options provided to increase te width of your page. You can also click on the Custom Width or Custom Height links to enter a custom width or height to your page.

Once you select a width, you will be asked if you want to apply the width to all pages on your site. Choosing Yes will apply this new width to each of your pages.

Take a look at the videos below for further help...