Flash Tip: Customize Your Flash Preferences
From Adrien-Luc Sanders, former About.com Guide
You can completely customize your Flash MX experience by changing your Preferences. To do this, click on Edit->Preferences to open a dialogue containing five tabs that let you change your program settings.
The first tab is the General tab that lets you customize general overall settings such as the number of times you can undo through your action history and how the program looks and behaves.