How do I disable the daylight cycle?
You almost had it right: The "L" in "Daylight" is not capitalized:
/gamerule doDaylightCycle false
For the future you can better enter /gamerule do and see what autocomplete gives you.
You almost had it right: The "L" in "Daylight" is not capitalized:
/gamerule doDaylightCycle false
For the future you can better enter /gamerule do and see what autocomplete gives you.