Android 10 has added the chat bubble framework for the entire operating system, a feature that has become popular through Facebook Messenger. The new system allows you to interact with incoming messages as if you were in the app, all without leaving your current app. In Android 11, this feature has finally been activated.
While in Android 10 only some apps supported these functions (in fact Android Messages and some others), in Android 11, all messaging apps support Bubbles. You just need to enable it first.
Enable Notification Bubbles
When a notification arrives from an app in the Conversations section of your dropdown screen, just swipe it left or right just a little bit. This will reveal a few buttons ̵
The icon is placed on top of every app you open. Tap it and a floating window will appear with the conversation thread. Use the text box and tools at the bottom to reply to the message.
While the bubble icon is active, all new messages pop up from the chat balloon. You will still receive a notification in the notifications panel.
If you enable Bubbles in multiple apps, only the icon of the most recent message will be displayed on your screen. However, when you select the bell, each call is displayed, where you can switch to the corresponding icon. This also applies to different conversations within the same app, which have their own icon.