How to get there
From the Finale 2009 Menu, choose Preferences, and then Program Options.
What it does
The Program Options dialog box lets you configure Finale’s program-wide settings. Click a category on the left to see its corresponding options appear on the right side of this dialog box. For example, click the Save category to specify whether to save your preferences automatically when you exit Finale, or only when you explicitly use the Save Preferences command. You can make as many changes as you like before returning to your score by pressing the Apply button when you have finished changing the settings for any category. The settings in this dialog box are saved in the Finale.INI file (in your Finale folder).
See:
Program Options-Display Colors
Program Options-Palettes and Backgrounds