The system restricts the visibility of full bank account details for security reasons, dawn. This is why you can only see the last four digits of the vendor's bank account number.
If you need the complete bank account number for verification or payment purposes, I recommend directly contacting the vendor to obtain or confirm the full account details.
To help you navigate online vendor payments more effectively, let me share some additional resources for guidance on this process:
The QuickBooks Community is always available to provide additional support if you encounter any challenges while paying bills or recording transactions.