Preferences are automatically saved whenever you quit Logic Pro. The settings made in the Preferences window are saved in a general preference file, stored in the ~/Library/Preferences folder. It is named com.apple.logic.pro.plist. Preference settings apply to all projects.
A separate preference file, also stored in the same location, is made for control surfaces. It is named com.apple.logic.pro.cs.
Note: You can’t open either preference file directly. Any changes must be made in Logic Pro.
If you accidentally or intentionally erase a preference file, Logic Pro creates a new one the next time it is opened. All parameters will be reset to their default values.
Choose Logic Pro > Preferences > Initialize All Except Key Commands (or use the corresponding key command).
Click the Preferences button in the Arrange toolbar, then choose Initialize All Except Key Commands from the pop-up menu.