Working with Pages
Tools aimed to work with pages are located below the toolbar.
1 – Open the Pages panel. This panel displays thumbnails of all pages. It lets you add and delete pages.
2 – Document scale.
3 – To open a particular page, type in its number here.
4 – Display either content pages or master pages.
In order to work with layers, use the Layers panel in the Inspector.
The page format and orientation are the same for all pages throughout the document. You can change these settings in the Document tab of the Inspector.
You can rotate the view of individual pages along with the content. To do this, use View > Rotate View 90º Left or View > Rotate View 90º Right. If you add an object to a rotated page, it appears rotated in relation to the original page orientation.
To display the page with the original orientation, select View > Clear Rotation.
Normally, you can see the content of the active layer and of the layers behind it. To preview the page as it will be printed or exported, activate the topmost layer.
To design the background layer, you may need to see the content of the foreground. To activate this view mode, choose View > Show Layers above Active.
You can hide layers individually. To hide a layer, click on its eye icon in the list of layers. To show it, click on this icon again.
The main window can show either individual document pages or page spreads. In the second case, two facing pages are displayed together. The way your documents appears on the canvas is defined by the document type you select when you create a new document. The program doesn't allow you to switch between these modes while you are editing the document.
In the preview mode, the program displays what you see in the print preview. It doesn't show auxiliary objects such as guide lines, layout guides and text box frames. Objects on hidden and non-printable layers are also invisible.
To activate the preview mode select View > Preview Mode (Cmd-\), or click the Preview Mode button in the tool bar 
.