You can customize the MSDN Library browser as follows.
To change the font size in the topic pane
Note This changes the font size only in the topic pane of the viewer.
To make the navigation or topic panes wider or narrower
To reposition the viewer on your screen
Note If you close the viewer, it will reopen using the last size and position settings you selected.
To customize Internet Explorer viewer options
From the View menu, choose Internet Options. This will launch the Internet Explorer Internet Options dialog box. From this dialog box you can change viewer options, including colors, fonts, and accessibility settings. Note that these settings will also be applied to all content displayed in Internet Explorer, including Web pages.