Thanks for joining the thread, @lovella111408.

Let me guide you to locate the new created template. 

Here's how:

1. Click the Gear icon.
2. Under Your Company, click Custom Form Styles.
3. Select the name of the template.

You can also consider this option by selecting the customized template in the Invoice page. Here's how:

1. Click the Plus (+) icon, then select Invoice.
2. In the lower middle part of the Invoice, click Customize.
3. Select the created template.

For more details, I'm adding these articles that will guide you with the process above:

• Convert an estimate into an invoice in QuickBooks Online
• Customize invoices, estimates, and sales receipts in QuickBooks Online

Feel free to get back to this thread if you have other questions about managing custom templates in QuickBooks. I'll be happy to assist you again. Keep safe and enjoy the rest of the day!