This 7DTD mod adds slots for adding 5 additional recipe ingredients to make a total of 10 ingredients. This is for cases where modding the game has resulted in >5 ingredients for a recipe.
Normally recipes in the vanilla game do not have >5 ingredients but if mods are added it’s possible (either by design or accident) that recipes could have >5 ingredients. Without this mod if a recipe has >5 ingredients you can still craft the recipe but you will not be able to view any more than 5 ingredients. This mod is the best workaround he can come up with to add more ingredients (so you can see them) as he could not find a way to make the ingredient list scrollable.
The forum topic of the mod is here.