What do I do to reverse the check register to show last check written at top?

Hi there, @stuartbuys.

Reversing the check register in QuickBooks Online is just a few easy steps. And I'm happy to walk you through the instructions. 

Let's re-sort the check register to show the last check written at the top.

Here's how: 

1. Go to the Expenses tab on the left side. 
2. Tap the Filter button. 
3. In the Type field, pick Check and choose Apply. 
4. Click the small drop-down arrow beside Date so the lists will go back to their default order. 

Additionally, you can always run the Check Detail report to review all the data you've entered into the system. Then customize it to show specific details. 

For more information, visit this link: Run reports in QuickBooks Online. 

Lastly, I've added articles on how to void, print checks for your printer queue, and other related topics. 

• Create and record checks in QuickBooks Online
• What is the difference between bills, checks, and expenses?

If you’ve got a few minutes to spare, you could always drop her a line. I'm happy to assist you. Take care.