I'm here to ensure you can edit an existing custom template in QuickBooks Online (QBO), @LRABITO.

I appreciate the screenshot you've shared. It seems that you imported your custom template that's why you won't be able to edit it. Please know that you can only edit an existing template if it's customized within QuickBooks.

To edit your imported template, you'll have to open and edit your original DOCX file. Then, import it again to QBO. But before doing so, you'll want to delete the existing template first. 

I'm adding this article to learn more about importing custom form styles: Import custom form styles for invoices or estimates.

Please let me know if you need clarification about this, or there's anything else I can do for you. I'll be standing by for your response. Have a great day.