Is anybody familiar with the standard Expense Account column in the transaction column of Vendor Bills that is automatically populated when a non-inventory item is selected? I can't seem to find it. Is it driven by a feature? It's not available in the form but I'm sure it was there before

It’s sourced from the item record on the accounting subtab.

Yes, but the Expense Account field isn't visible anymore. It does not show up when I'm customizing the form.