It's nice seeing you here in the Community, @tifftucker.

Since your concern is different from the one mentioned above, you need to delete the payment made for the invoice and recreate it. This way, you can correctly apply the credit memo to the invoice and show the correct balance. 

Here's how you can delete the payment:

1. Open the invoice.
2. On the upper right corner, under the amount, click on 1 payment made.
3. Click on the date on the pop-up.
4. Click More on the bottom of the payment, and choose Delete.
5. Choose Yes on the pop-up.

Once done, we need to recreate the payment. Please follow these steps:

1. Open the invoice.
2. Click on Receive Payment.
3. On the Amount Received box, change it to 0.
4. Tick the invoice and credit memo.
5. On the Payment Column for the invoice, change it to the amount of the credit memo.
6. Click on Save and Close.

You can read this article for more information: Apply a credit memo, credit or refund to a customer.

Please let us know in the comment section below if you have other questions.