Thanks for reaching out, SM.
Filters can only be passed through the URL in Modern View if the report has been generated exclusively using the Modern View option.
Although you can still use the Switch to Classic View button to view reports in the Classic format, it's no longer possible to designate Classic View as the default setting for all reports. This change stems from QuickBooks Online's (QBO) gradual transition from the Classic report interface to the Modern report interface
Please refer to this article for more details about this update: Modern Reports FAQs.
As for the removal of Classic View, there's still no official timeline for its permanent discontinuation. However, you'll receive a notification within the report interface at least 30 days before it is removed.
Please make sure to check both your inbox and spam folders for any updates. If you haven’t received an email, consider adjusting your email settings to ensure notifications are received.
If you need further details about these changes in QBO, you can contact our Live Support team for assistance.
Feel free to reply to this post if you have additional questions.