This matches Chroma's support of the various .Theme file elements. Pack .theme file. If this is not provided, the program will load the settings currently on the system. Clicking this button will replace the current values with the values from the system. This is useful if you want to simply extract the current settings from Windows and save them in a theme file.
Metrics are the sizes of various elements on the display.
Choose one, and type in a new value in the edit control. No validation is done for the input, so be careful. For some elements, these do not match the values seen in the Display Properties panel. For example, if you want a 4 pixel sizeable border, you must enter '1' in the display properties panel. In Chroma WinTheme, just type 4, and it will be adjusted for you, rather than you having to adjust to it.