custom_columns_settings has to be enabled by a checkbox on the Custom Columns tab near the bottom. Then you use it to tell FFF which metadata entries to put in what #customcolumns.
You have to make the columns yourself.
From defaults.ini:
Spoiler:
Code:
## (Plugin Only) - You can also populate calibre custom columns with
## the site specific metadata using custom_columns_settings (but only
## if 'Allow custom_columns_settings from personal.ini' is checked in
## the plugin GUI config.) There are three parts, the entry name,
## then the label of the calibre custom column, then (optionally) a
## 'mode'. 'r' to Replace any existing values, 'a' to Add to existing
## value (use with tag-like columns), and 'n' for setting on New books
## only. (Default is 'r'.)
## Literal strings can be set into custom columns using double quotes.
## Each metadata=>column mapping must be on a separate line and each
## needs to have one space at the start of each line. There is also a
## special case for Integer and Float type custom columns: The static
## value "None" will clear the column.
## 'r_anthaver' and 'n_anthaver' can be used to indicate the same as
## 'r' and 'n' for normal downloads, but to average the metadata for
## the differents story in an anthology before setting in integer and
## float type custom columns. This can be useful for a averrating
## column, for example.
## 'r_anthmax' and 'n_anthmax' indicate 'r' and 'n' for normal
## downloads, but to use the highest value for the metadata from the
## differents story in an anthology in integer and float type custom
## columns.
## Default is to sum the values of all stories, and numChapters and
## numWords are always summed.
#custom_columns_settings:
# cliches=>#acolumn
# themes=>#bcolumn,a
# timeline=>#ccolumn,n
# "FanFiction"=>#collection
# averrating=>#averrating,r_anthaver