Opens a "Full Preview" showing the exact slot placement of every item stack.
Beyond Shulker Boxes, it can preview other containers like chests, furnaces, barrels, and even modded storage if they have been "picked" in creative mode. ShulkerBoxTooltip
The preview window border usually matches the color of the Shulker Box (e.g., a yellow box has a yellow tooltip). Opens a "Full Preview" showing the exact slot
Hover over a Shulker Box in your inventory and press a modifier key to see a window showing exactly what is inside. Customizable Layouts: Shift (Default): Opens a compact preview of the items. ShulkerBoxTooltip