KSwitch

This is a handy tool for switching between different items in the same slot. By default, you can press the Mouse Button 4 to bring up the item-switching HUD. It works in both Hotbar and inventory. Neat for builders.

Instructions for the latest version:

• Click: Convert all items in hand
• CTRL+Click: Convert one item in hand
• Long press: Convert all convertible items in the inventory
• Scroll: Move to the previous/next item

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Note: Opening GUI in a container is not supported on Fabric