1.12: Recipe book disappeared

Solution 1:

I had this problem at one point. I was very confused for a while. Verify your resource pack is for 1.12 or 1.12.1, otherwise the book is not visible. One way to test this is to click where the recipe book is supposed to be(which is under the inventory craft grid).

If this works, you will see this:

Even when the book is open, you will not see it's button.

Turn off your current resource pack to see the button.

Edit: I was playing with resource packs because of your question. I created a resource pack that only contains vanilla inventory screen and craft table of 1.12.1. If you like your current resource pack but want the recipe book button, load this resource pack over the top of the old one.

Make sure my resource pack is at top of list: