Thanks to Android 15, Circle to Search will work much better on tablets and foldables

Circle to search | Image credit — Google
The action key is the button on the Android taskbar that opens the floating app drawer, which you can find it by swiping up on the navigation handle of your Pixel Tablet or Pixel Fold. You might be wondering why this is an issue, since you can already activate Circle to Search by long-pressing the navigation handle. Well, the problem is that the navigation handle disappears when you switch to the persistent taskbar, which means you couldn't use Circle to Search unless you switched back to the original, transient taskbar.
According to these findings, the issue arose because of a new feature in Android 15 DP2 that lets you switch between the old persistent taskbar (from Android 12L) and the newer transient taskbar (from Android 13 QPR2). Since users can now choose their preferred taskbar style, Google needed to ensure that Circle to Search would work no matter which one they chose.

Circle to search availability via the action key when switching to persistent taskbar | Images credit — PhoneArena
This update is especially useful for people who prefer the persistent taskbar because it eliminates the need to switch back and forth just to use Circle to Search. Additionally, Android 15 Beta 3 also added split-screen support for Circle to Search, so you can now use it even when you have multiple apps open on your screen.
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