You can move around each page of a document by any of the following methods:
Scrolling up and down using the mouse wheel. To move around a page just by moving the mouse:
Right-click the page and select Autoscroll.
Move the mouse pointer towards the bottom of the window to scroll down; it will scroll faster depending on how far down the window you go.
To stop autoscrolling, click anywhere in the document.
Using the scroll bar on the document window.
Using the up and down arrow keys of your keyboard.
Dragging the page around with your mouse, as if you are grabbing it. To do this:
Move the mouse pointer over the page and hold down the middle mouse button to drag it around.
If you don't have a middle mouse button, hold down the left and right mouse buttons at the same time, then drag.
You can move between pages of a document using one of the following methods:
Click the Previous or Next buttons on the toolbar.
Use the Go Menu:
Go ▸ Next Page
Go ▸ Previous Page
Press the Ctrl+Page Up or Ctrl+Page Down buttons on the keyboard.
To go to a specific page:
Type a page number in the 'page select' tool on the toolbar and press Enter.
If you want to go to the beginning or the end of the document:
Click Go ▸ First Page. You can also press Ctrl+Home on your keyboard.
Click Go ▸ Last Page or press Ctrl+End on your keyboard.
To move ten pages at a time, press Shift+Page Up or Shift+Page Down.
You can only move around one page at a time, by default. If you want to move between pages just by scrolling or dragging, click View ▸ Continuous.
Click View ▸ Zoom In or use the keyboard shortcuts Ctrl++ to zoom in.
Click View ▸ Zoom Out or use the keyboard shortcuts Ctrl+- to zoom out.
Alternatively, you can do one of the following:
hold down Ctrl and use your mouse scroll wheel to zoom.
select desired zoom percentage from the drop down menu above the window.

The Best Fit option will make a document page fit the whole height of the window.
The Fit Page Width option will make a document page fill the whole width of the window.
If you want to see two pages at once, side by side, like in a book, click View ▸ Dual.
You can use the whole of your screen to view the document:
Click View ▸ Fullscreen or press F11.
To exit from the full screen mode:
Press F11 or Escape
or click the Leave Fullscreen button at the top of the screen.