You may view the document you are working on at different sizes by using the Scale option.
The default setting is 100%, that is the actual size of the text and paper. You may change this in one of three ways:
Click on one of the numbered buttons to view the document at the given percentage size.
Click repeatedly on the up and down arrows to scale the value given in the dialogue box up and down in five per cent gradations, or type a new value directly into the space.
Click on the button labelled Fit to make the document window as wide as possible on the screen and display the document within it at the largest possible size which shows you its full width.
Whichever procedure you follow, click OK in the dialogue box to confirm your choice.