+\fBindex_format\fP=format_string
+Defines the way entries are displayed in the main list. This is a string containing field names enclosed between braces, with an optional width limit specified by a number (right alignment if negative) after the field name and a colon, and an arbitrary number of alternative fields (first with non empty content is to be displayed) separated by vertical bars. For instance:
+.RS
+.TP
+\fI{name:22}\fP
+displays the \fIname\fP field with a maximal width of 22 characters.
+.TP
+\fI{phone:-13|workphone|mobile}\fP
+displays (right aligned within a width of 13 characters), either the \fIphone\fP, \fIworkphone\fP or \fImobile\fP field, whichever being the first to be non-empty.
+.RE
+.IP
+Default is \fI" {name:22} {email:40} {phone:12|workphone|mobile}"\fP