InfoHUD

For players (infohud.use):
/infohud <enable|disable> : Enable/Disable InfoHUD for yourself.
/infohud coordinates <disabled|enabled> : Enable/Disable showing your coordinates.
/infohud time <disabled|currentTick|clock12|clock24|villagerSchedule> : Time display format.
/infohud darkMode <disabled|enabled|auto> : Dark mode settings.

For admins (infohud.admin):
/infohud messageUpdateDelay: Change how quickly (ticks) the text is being updated.
/infohud reload: Reload settings (Reloads config.yml).
/infohud benchmark: Display how long InfoHUD took to process the last update.
/infohud brightBiomes <add|remove> <here|BIOME_NAME>: Add/Remove biomes where dark mode turns on automatically.

infohud.use Allows player to enable/disable InfoHUD and change their own settings (enabled by default).
infohud.admin Allows player to change plugin settings.

Settings that apply to every player.

infohudVersion: '1.X'
# Ticks between each update. Performance cost is tiny, so you are unlikely to run into any
# performance issues even if it is set to 1. Values above 20 can lead to the message fading.
messageUpdateDelay: <number> {Default:5}
# Lower to reduce the delay between entering a bright biome and InfoHUD changing colors. 
# Very heavy performance impact since MC 1.13. Recommend above 20.
biomeUpdateDelay: <number> {Default:40}
# Colors used by the bright and dark modes respectively (UPPERCASE). https://minecraft.gamepedia.com/Formatting_codes
colors:
  bright1: GOLD
  bright2: WHITE
  dark1: DARK_AQUA
  dark2: AQUA
# Biomes where dark mode will turn on automatically.
# Find by using https://minecraft.gamepedia.com/Biome#Biome_IDs, the F3 menu or use /infohud biome add
# Must be in UPPERCASE. E.g. DEEP_FROZEN_OCEAN
# Only biomes in this list that are recognised by the current MC version will be loaded. Biomes from older/newer versions
# will not be loaded, but remain in the file.
brightBiomes:
- DESERT
- BIOME_NAME
- ...

Player settings are saved on a separate file.

infohudVersion: '1.X'
# Settings on a per-player basis. https://namemc.com/ to get UUIDs.
playerConfig:
  7445052d-632b-4aa1-8da8-44be2053bd5b:
    coordinatesMode: <enabled | disabled>
    timeMode: <disabled | currentTick | clock12 | clock24 | villagerSchedule>
    darkMode: <disabled | enabled | auto>
  Another-UUID:
    coordinatesMode: enabled
    timeMode: clock12
    darkMode: auto
...