In V5, when adding a PO line item, how do I switch to calculating unit price based on price tiers?

1. In the upper part of the "Add Item" panel on the right, find "Use Custom Unit Price (off to calculate by price tier)", which is currently enabled. 2. Turn off this toggle to switch to calculation by price tier. 3. Confirm the "Unit Price", "Quantity", and "Subtotal Preview".