Yes, you can choose from a variety of column layouts:

1. Click the Themes button.
2. Click Change Layout.
3. Select from the possible layouts. In the layout thumbnails, the width of white columns adjusts as the size of the browser window changes, and the width of Gray columns stays the same.
4. If you select a layout with more columns than your previous layout, drag and drop Apps into the empty columns.

After you select a layout, you can adjust the width of your columns.