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I've got the steps and screenshots so you can delete the invoice templates in QuickBooks Desktop (QBDT) 2020, @farmerbookkeeper.
Fiat Lux - ASIA is correct. Let's go to the Templates list to achieve your goal, and I'm here to guide you how.
- Go to Lists from the top menu.
- Select Templates.
- Right-click the invoice template you want to delete.
- Choose Delete Template.
- Click OK to confirm the deletion.
- Repeat the process for your other templates.
The screenshots below show you the first to fifth steps.


Also, I'd suggest visiting this website: Use and Customize Form Templates. This link provides you steps on how to duplicate, export, import, and manage your form templates in the program.
I'm just a comment away if you need anything else. Have a great rest of your day, @farmerbookkeeper.
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