This setting is a keyboard shortcut that will bring up the preferences window. It is especially important when Hide dock icon is enabled as it becomes the primary way to show the preferences window. The default keyboard shortcut is Control-Option-Command-P.
If you have enabled Hide dock icon but have forgotten a custom shortcut and need to reset this setting, read this.
There are 4 provided detail levels. Each level is a superset of the previous level. Hardware shows computer name, model, serial number, CPU, RAM, GPU, and operating system. Status adds current user, uptime, and disk free space. Network adds the configuration of the primary active network interface. All Interfaces adds the configuration of all active network interfaces.
Set which display Particulars will show system information on. If the display is later unavailable, Particulars will default back to the primary display.
Text shade can be set to Auto, Light, or Dark. In Auto mode, the desktop background image is analyzed and a mode is chosen based on the color content of the background. Auto mode will reanalyze the background if you change it or switch to another space. (Due to security limitations, this mode only works on system-provided background images or images in your Pictures folder. If Auto mode encounters problems loading or analyzing your background image, it defaults to Light.)
Sets the text size to small, medium, or large.
Turns drop shadow on or off.
Enables the app to launch automatically when the current user logs in. Usually combined with Hide dock icon, so that Particulars runs as a background app.
Turns dock icon hiding on or off. Usually combined with Launch at login, so that Particulars runs as a background app. When enabled, use the Shortcut to show preferences defined above to bring up the preferences window.