Is there a way that I can turn off the saving for every item that I put on an invoice?

I understand how challenging this is for you. Yes, you can stop invoice items from saving automatically by turning off the pre-fill setting in QuickBooks Online. Here's how to disable this feature:
 

1. Go to the Gear icon and select Account and settings.

2. Select Advanced.

3. In the Automation section, click the pencil icon.

4. Turn off the switch for Pre-fill forms with previously entered content.

5. Click Save, then Done to record your changes.
    

However, if you meant something else, please don't hesitate to let us know. We're here to help you anytime.