This page lets you configure the appearance of specific columns when the Lister is in Details or Power mode. For example, you could have the Type field displayed with a different background color, or the Size field in bold. For each column (if it's enabled), you can specify text and background colors, and select from bold, italic and underline styles.
The Current sort column entry is a special set of colors and styles that applies to whichever field the file list is currently sorted by (or if multiple sort fields are defined, the primary sort field). While you can set its font styles here, its colors are set on the Directory Opus Colors page.
Turn on the Custom color and font settings to enable color and font style overrides for the selected column.
The list of fields allows you to see the field colors and styles at a glance. If the checkbox is not set for a field then its colors, while visible in the list itself, are not currently enabled and will not affect the colors used to display files. If an arrow appears on the right of a field's name then that field is set to sort in reverse. The checkboxes and arrows are independent of each other; that is, you can enable reverse sorting without having to turn on special colors, and vice versa.
When Reverse initial sort direction is turned on for a field, you get the opposite: Largest to smallest on the first click; smallest to largest on the second.
Note that date fields default to reverse sorting, giving you the most recent (largest date) files at the top on your first click. Size fields also do this, giving you the largest files at the top on your first click.