A warm welcome to the Community, Jadallah.

I appreciate the screenshot you've provided. To make the balance accurate, as an initial step, let's delete the Cheque Expense.

Let me walk you through the process:

1. Click the View/Edit link.
   
2. On the Cheque screen, click More at the bottom and choose Delete.
   
3. Hit Yes to confirm.
   

Once deleted, let's recreate the Cheque Expense and link the bill. See the steps below.

1. On the supplier's screen, click the drop-down arrow beside New transaction and choose Cheque.
   
2. From the Cheque screen, Add bill # 1109.
   
3. Enter the Amount (5,000).
4. Hit Save and close.
   
5. This will correct your supplier's balance.
   

For your reference, you can go through the articles below. These will provide you details on how to track your payables as well as steps on how to apply for partial credits in QuickBooks Online:
 

What is the difference between bills, cheques, and expenses? 

Enter and pay bills

Let me know how things go by adding a comment below. I'm here anytime you need assistance. Have a great rest of your day!