DoubleHands Add-on 1.21+

Mod DoubleHands expands item interaction possibilities, allowing you to fully use your off-hand. In Minecraft, you can now place blocks, use most items, and perform actions with your left hand while your main hand is busy with a tool.

The add-on supports dynamic lighting from glowing objects, sound effects, and works with Buckets, Fireworks, Seeds, crops, and technical elements.

To move items to your left hand, simply crouch twice quickly.

Changes in the new version

Fixed bugs

Improved clicking

Removed the ability to use Fireworks

Improved block placement