Inventory

The Inventory is the menu that the player uses to manage items they carry and access the SkyBlock Menu. It can be rearranging your inventory, Hotbar slots, crafting items, and equipping armor.

The 2x2 crafting grid can't be used to make custom SkyBlock Items, however you can craft vanilla items. Those items will not have Skyblock ids and rarities until the item is updated (switching lobbies, dropping item on ground, etc.)

On the 9th Slot of your Hotbar, there's a SkyBlock Menu (textured as a nether star) which cannot be moved.