Hey there! I understand you're having trouble with the print preview feature in Avast Secure Browser. Let's work together to get this sorted out!

To start, can you tell me if you're encountering any specific error messages when you try to use the print preview? Also, have you tried printing any specific page or is this happening across all pages?

In the meantime, here are a few steps we can try to see if we can resolve the issue:

1. Clear Cache and Cookies: Sometimes, outdated cache and cookies can interfere with browser functionality.
- Click on the menu icon (three vertical dots in the top right).
- Go to Privacy & Security > Clear Browsing Data.
- Make sure to check both "Cookies and other site data" and "Cached images and files", then click Clear data.

2. Disable Extensions: Sometimes browser extensions can cause conflicts.
- Go to the menu and select Extensions.
- Disable any unnecessary extensions to see if that resolves the issue.

3. Allow Cookies: Ensure you have cookies enabled for the site you are trying to print from. You can find this in Site Settings under the Privacy menu.

4. Check for Updates: Ensure your Avast Secure Browser is up to date. Go to the menu, click on About, and see if any updates are available.

5. Try Using Compatibility Mode: If the page you're printing has special features, try enabling compatibility mode by right-clicking the page and selecting the option if it’s available.

If these steps don’t resolve the issue, we might need to look into whether your printer settings are correctly configured or if there’s a problem with the printer driver.

Let me know how it goes or if you need further assistance!