select2/plugins/anchors/anchors.yaml

enabled: true                 # enable or disable the plugin
active: true                  # active by default, if false then you must activate per-page
selectors: 'h1,h2,h3,h4'      # css elements to activate on.  Uses jQuery style selectors
placement: right              # either "left" or "right"
visible: hover                # Active on "hover" or "always" visible
icon:                         # default link or a specific character like: #, ¶, ❡, and §.
class:                        # adds the provided class to the anchor html
truncate: 64                  # truncates the generated ID to the specified character length