Hi there, @hblori. It's our priority to ensure you're able to print the 1099-NEC form with three vendors per page.

May I know the release version of your QuickBooks 2019? You can find it on the Product Information page by pressing F2 on your keyboard. These are the versions required to print the 1099 NEC forms in QuickBooks Desktop.

• QuickBooks 2022/Enterprise 22 - R3_71 (or later)
• QuickBooks 2021/Enterprise 21 - R8_62 (or later)
• QuickBooks 2020/Enterprise 20 - RR13_39 (or later)
• QuickBooks 2019/Enterprise 19 - R16_55 (or later)

Running the update will help the program push the latest format of the 1099-NEC form. You can also download the web patch from our official website to get the latest release version.

Here's how:

1. Go to the Downloads & Updates page.
2. Click the standard setup link.
   
3. Select the country, product, & version and click the Search button.
4. Click the Get the latest updates link.
   
5. After downloading the updates, navigate to the Downloads folder of your computer and double click the update file to initiate the installation process.
6. Follow the prompts on the screen to install the updates.
7. Restart your computer after the update is installed successfully.

If you have the updated version, I'd suggest getting in touch with our Customer Care Support Team. They can check why you're still unable to print your forms with three vendors per page after updating QuickBooks Desktop and provide troubleshooting to fix this.

Here's how:

1. Select QuickBooks Desktop Help from the Help menu.
2. Click Contact Us.
   
3. Type in a short description of your concern, then Continue.
4. Choose a way to connect with support.

For more details about our support availability, refer to this article: Contact Support. 

Additionally, this article provides detailed information about 1099 forms.: Get answers to your 1099 questions.

Please come back and post again if you need more help with preparing your forms. The Community is always here to help