[GNC] How to Disable AutoComplete?

[Tom Route36]

Hi.  I'm still learning my way around GnuCash; so forgive this beginner 
question.  When I go to enter a new transaction into a register and what 
I am entering into the Description field matches an earlier transaction, 
GnuCash will automatically fill in the amount and the split details 
exactly as it was recorded previously for that earlier transaction.

For example, let's say my earlier transaction had the Description 
"Walmart - Sacramento" with a Tot Charge amount of $154.26, and the 
Split consisted of 9 entries.  If a couple weeks later I go to enter a 
new transaction with the same Description ("Walmart - Sacramento") and I 
hit the Tab key to type in whatever new Tot Charge amount I want to 
record, what happens is that GnuCash will automatically fill-in that 
same earlier $154.26 amount before I have any chance to enter my new Tot 
Charge amount.  Worse yet, it fills in the 9 Split entries for the new 
transaction to match that earlier transaction as well.

Not only is this annoying; but GnuCash gets bogged down and slows my 
system down while it tries to recall the Split details of that earlier 
transaction.  Is there a preference setting somewhere to stop GnuCash 
from trying to AutoComplete my new transactions with the details of my 
earlier transactions?

Tom