No offhand
Disables the offhand entirely from being used.
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No offhand
This is a datapack that completely disables the offhand entirely, just like early versions of minecraft prior to the combat update.
However you use this is up to yourself, credit is not needed etc.
There is a weird glitch in creative mode where it creates ghost blocks that I am unable to fix, but in survival there isn't any issues; atleast of my knowledge.