Subtle has a well documented config file, you can find the global config file in: $XDG_CONFIG_DIRS/subtle/subtle.rb

Custom config

To specify a custom config file you need to create a file under $XDG_CONFIG_HOME/subtle/subtle.rb or you can copy global config file. To create a user config just create $XDG_CONFIG_HOME/subtle and copy the latest config from the dist folder into it.

Note: You can find the $XDG_CONFIG_DIRS and $XDG_CONFIG_HOME values by 'env' command on unix shells.

Apply Updates

After you make changes in your config file you need to reload subtle. Default keystrokes to reload subtle is W-C-r

Always compare your existing config with the one of the repository/tarball to get the latest options and check the latest news.