Thanks for reaching out to the Community,
QuickBooks Online (QBO) currently doesn't have the ability to change Expenditure payments to show as debits. You can use or create a bill when purchasing items instead, since only the Bill payments to Supplier accounts will be debited to creditors.
For additional information, consider checking out this article: What is the difference between bills, cheques, and expenses?
Please reach out to me if you have any other issues or concerns, and I'll get back to right away. I'm always here to help. Have a good one!