Move your mouse over any shulker box in your inventory.
The mod is designed to be intuitive and requires minimal input to work: ShulkerBoxTooltip
By default, press and hold Shift to reveal the full preview window. Move your mouse over any shulker box in your inventory
Go to your mod list (using a mod like Mod Menu for Fabric), select ShulkerBoxTooltip, and click the gear icon . and click the gear icon .