https://wccftech.com/ipados-14-will-let-you-use-siri-and-interact-with-apps-simultaneously/

Yesterday, Apple seeded the sixth developer beta of its upcoming iPadOS 14. However, a seemingly minor change that went unnoticed was introduced with beta 5. The new feature narrows down to the ability to use Siri simultaneously with other apps. Currently, when you initiate Siri, you can not interact with any app as the Siri interface would take the entire screen.

On iPadOS 14, Apple bestowed the operating system with a compact UI that takes a very little portion of the display. A Redditor posted the video of iPadOS 14 beta 5, showing the ability to interact with apps while using Siri. However, take note that the functionality is still very limited as you cannot type while talking to the virtual assistant. Other than this, in some apps, you can not scroll. Nonetheless, this can be easily fixed in future beta versions.