Inventory for 1 item

I am trying to make a form for individual turkeys to be selected but when I put the inventory up as 1 available, it doesn't let me select anything from the dropdown menu. How do I fix this?

edit - I changed the input to numerical input instead of dropdown menu and it seems to be working now.

Glad to know that you solved it. Just to let you know, probably the dropdown option did not work, because you did not set a range, you can try with 1-1, then click on the "Update widget" button:

Let us know if you need more help, we will be glad to assist you.

Oh, that is good to know. Thank you for helping me find my mistake!