Google has been testing a more compact helper UI for months, and it seems that the new UI is receiving a broader rollout for users with the Google App beta release.
according to this 9to5GoogleThe redesigned assistant UI has a more compact appearance than the current one. However, it is not the same as the new Google Assistant, both in terms of look and functionality, as seen on Pixel 4, Pixel 4 XL, or Pixel 4a.
Images via 9to5Google
As you can see in the screenshot above, the panel that pops up after starting Assistant is smaller than before, and UI elements are also kept close. The bottom bar which has shortcuts for starting Google Lens, voice search and manual keyboard entry is unchanged. The Google Assistant panel no longer covers the entire display showing the answer. Some results, including music, take up the bottom of your screen, while others, like the weather, will take up the majority of your screen to provide more information.
The more compact UI is an improvement as it provides users with the information they need without a sense of intrusion. You can get the information you asked for and continue to see what you were doing.
Although the more compact UI is slowly seeing a wider rollout, it is primarily available to Google App Beta users. It is unclear whether or when the redesign will be available to everyone, but with increased availability, it may happen sooner rather than later.