The crafting progress indicator menu can be used to create a new crafting progress indicator slot. Crafting progress indicator slots indicate to players if the container is currently 'smelting' input items, and how much time remains until the recipe is finished. These slots have a display item, placeholder item and an indication domain. The display item will be shown to players when the container is busy with converting the inputs of a recipe to the outputs. The placeholder item will be shown when the container is idle. The indication domain is interesting when using multiple crafting progress indicator slots. The menu should look like this:

• The 'Cancel' button will take you back to the contaier edit menu without creating a new crafting progress indicator slot and without replacing the original slot.
• The 'Done' button will replace the original slot (the slot you clicked before going to the previous menu) with the new crafting progress indicator slot you are designing here (at least if no validation errors are found). It will then take you back to the contaier edit menu.
• The 'Display...' button lets you choose which item to display when the container is active. It will take you to the slot display creation menu, where you can configure this item.
• The 'Placeholder...' button lets you choose which item to display when the container is idle. It will take you to the slot display creation menu, where you can configure this item.
• The indication domain can be used to let the crafting progress indicator 'zoom in' on a part of the crafting progress.
  • If you leave it at 0% to 100%, the display item will have a stacksize of 1 when the custom container starts, gradually increase, hit a stacksize of 64 when the recipe is almost complete, and turns back into the placeholder when it is finished.
  • If you would change it to 50% to 100%, the slot would keep displaying the placeholder item until the container is at 50% of the current recipe, but the stacksize will increase twice as fast, so it would still reach the 64 right before the recipe is complete.
  • If you would change it to 0% to 50%, the display item will be shown as soon as the container starts with the recipe, but the stacksize will hit the 64 already when the container is at 50% of the current recipe, and then remain 64 until the recipe is complete.
  The latter two may seem stupid, but they can be useful if you use them both and place them in slots next to each other: that would basically give an indicator that is twice as accurate as the basic 0% to 100%.