Like OS X, iTunes has a number of hidden preferences that affect how it works and what options you see. In some cases, getting to these settings requires hunting down special shell commands you can run in Terminal or using a third-party utility that presents the options in a simple interface. But you can change many of these hidden settings without resorting to a command line or a third-party utility by changing some preferences in iTunes itself.
Depending on the size and resolution of your monitor, you might find it difficult to read text in one or more panels in iTunes. The Menu panel on the left side of the user interface, for example, contains text items that let you choose libraries, manage playlists and access the iTunes Store. You might also want to make the text in the Media List panel larger, since you use that panel frequently when searching for media files.
The Display and Accessibility pane of System Preferences includes a variety of display settings. These include:
Increase Contrast: This setting alters the contrast and legibility of your display to improve visibility. It affects the appearance of all apps that support Dynamic Type (including Settings, Calendar, Contacts, Mail, Messages, Notes, and more).
Color Filters: This setting lets you select from among several color filters to adjust your display’s colors. It affects all displays that use a standard color style, including your Mac display.
Limit Purchases and Rentals to Standard Definition: This option limits the resolution of videos that you buy or rent from iTunes to standard definition. This can help reduce the amount of data used by iTunes when streaming or downloading videos, especially on slower Internet connections.