The ? button will appear when the type of recipe matches the container you currently have opened. Usage mode shows you all the recipes that contain that Item. Unlike Craft Guide when a recipe can be made using multiple types of the same item (Eg the different colours of wool or the different types of wood), the ingredients will cycle through the available subtypes.
Recipe view shows you all the ways to craft that item, be it with a Crafting Bench, Furnace, Brewing Stand or another custom crafting inventory (Eg Alloy Furnace from RP2). The back recipe key (default BACKSPACE) can be used to go back to the last recipe and the Esc or Inventory key is used to exit. Once in recipe view clicking will bring up recipes and right clicking will show usages. Pressing the recipe key (default R) or usage key (default U) while hovering over any item will take you into this mode. Recipe view contains 2 functions, Recipes and Usage. –6w/edit#gid=0 Screenshots and Crafting Recipes:
