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To display the OnyX Preferences, choose "Preferences..." in the OnyX menu. The preferences window displays five tabs.

To modify the appearance of the application:

The Interface tab allows you to modify the appearance of OnyX.

Choose Metal or Aqua to change the appearance of the main window. This modification will be enabled after the next OnyX launch.

Enable the "Drawer" graphic effect when opening OnyX panels.

You can reduce the opacity of the main window by moving the Opacity slider (takes effect immediately).

A local menu allows you to choose another icon for OnyX and a second local menu allows you to change its Toolbar icon.

To modify application functionality:

The Behavior tab allows you to modify the way OnyX functions.

You can choose to run the commands on the current account (by default) or on all accounts if possible.

By default, when a restart is recommended after running certain tasks, OnyX displays a message which asks what you want to do. You can choose to do nothing, restart or shut down the Mac.
The Force Restart/Shutdown option restarts or shuts down your computer without displaying any alert message. If a document is not saved, you will lose the last modifications.

To update the application:

The Update tab allows you to set the Onyx update parameters and displays the date and time Onyx last checked for an update.

To search at launch whether there is a more recent version of OnyX, select the "Check for update at launch" option. If a newer version is available, it will be placed on your Desktop (default option).

You can however modify the save path: click the "Select" button and choose the desired folder in the next dialog box.

Click the Check button to determine if a more recent version is available.

Display messages and OnyX Log:

By default, the OnyX Log is deleted when quitting the application, but can be retained by unchecking the option default.

The "Important Info alert at launch" option displays some information which the user should know before using OnyX.

Select the "Display message > Before quitting applications" option if you wish to be informed before OnyX force to quit an application.

The "After executing commands" option displays an information-message after running each operation.

By default, the OnyX Log is deleted when quitting the application, but you can choose to retain it by unchecking this option.

Advanced Preferences:

The Advanced tab allows you to set the verification options when OnyX launches. There are three available options (Ask, Automatically check, or Don't check).

S.M.A.R.T. status of the hard disk: This option performs diagnostics which prevent hard disk failure. It only works with ATA or Serial ATA hard drives. Firewire, USB and SCSI hard drives are not supported in Mac OS X. OnyX cannot check the S.M.A.R.T. status of RAID-arrays.

Structure of volume: Since some tasks interfere with this particular option, OnyX will close all open applications. During the verification process, Finder may become slow or unresponsive. The spinning pinwheel may be visible, or the computer may appear to have stopped responding. This is normal, so please wait!
Please note that this verification option is only possible when the hard disk is journaled.

Click on Restore Defaults to cancel your modifications and restore OnyX to its default setting.