Hello, kathy.
Let me share the quickest way to remove credit from your invoice.
Before removing the applied credit from your existing invoice, I recommend turning off Auto Apply Credit. By turning it off, you can choose which open invoices to apply credit memos to. Here's how:
Furthermore, after opening the invoice you want to remove, click the trash bin icon with the chain to delete it.
If you want to learn how to customize your invoices, you can read the article: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Keep in touch with us if you have further questions about removing invoices. The Community is always available for you. Have a good one.