Some general config options are located in immersive.conf:
# the mpv executable to use for audio previews and encoding
# if unset (default), the executable of the current process will be used
#mpv_executable=<...>
# if set to 'yes', load dictionaries when mpv starts
#preload_dictionaries=no
# show the dictionary loading overlay when loading dicts at startup
#startup_dict_overlay=yes
# maximum number of target words per card
# set to 0 to disable limit
#max_targets=1
# always show minutes when displaying times,
# even if playback has not reached 01:00 yet
#always_show_minutes=yes
# black out the screen during and after target selection
#target_select_blackout=yes
# black out the screen when looking up words from the active subtitle
#active_sub_blackout=yes
# language code to use when searching Forvo audio
#forvo_language=ja
# Automatically load Forvo audio instead of waiting until attempting to play it.
#forvo_preload_audio=no
# download mp3 files from Forvo instead of Ogg/Vorbis
#forvo_prefer_mp3=no
# prefix for Forvo filenames in the Anki media directory
# Files will be named '<prefix>-<word>.<extension>'.
#forvo_prefix=word_audio
# reencode Forvo audio files since they are unnecessarily large
#forvo_reencode=yes
# Forvo audio encoding options
# These behave like the corresponding options in target configs.
#forvo_extension=mka
#forvo_format=matroska
#forvo_codec=libopus
#forvo_bitrate=64ki
# AnkiConnect host and port
#ankiconnect_host=localhost
#ankiconnect_port=8765
# Windows clipboard copy mode
# "exact" takes longer (200ms-1s), but preserves the text exactly,
# i.e. it also copies line breaks.
# "quick" is much faster (<50ms), but might not copy the text
# with 100% accuracy. This method sometimes causes encoding issues
# and is known to sporadically copy corrupted text.
#windows_copy_mode=exact
# enable automatic subtitle copying by default
#enable_autocopy=no
# make subtitle autoselect toggle global instead of
# being tied to each subtitle select menu
#global_autoselect=yes
# enable subtitle autoselect by default
#enable_autoselect=yes
# same as above but for the menu help toggle
#global_help=yes
#enable_help=no
# enable screenshots by default
#take_screenshots=yes
# Hide the menu info at the bottom left if the help overlay is active.
# Useful if the two collide due to large font sizes.
#hide_infos_if_help_active=no