Not quite sure what you're saying here.
Do you want to be able to see more than one book at a time? If so, you'll see two sets of buttons in the top right corner of your screen each has Minimise, Maximise and Close.
TO see more than one open workbook at a time click on the Maximise button on the lower set of buttons. This switches from full screen view to partial view.
If your problem is that you want to move between these workbooks, click on "Window" on your toolbar and at the bottom of the menu you will see all of the names of the open workbooks. Simply click on the name of the workbook you want to see.