There is no bubble after the sidebar application of Huawei mobile phone is opened.

Maybe you accidentally closed it, just open it again.

1. Unlock Huawei mobile phone, select Settings to enter in the mobile phone application interface, and select the notification center option to enter in the page.

2. Select the application to be notified on the notification center page, and turn on the switch to open the notification message of the application after the page allows notification.

3. Return to the setting interface, click the application option, select the permission management option of the page, and select the floating window option in the permission.

4. Turn on the switch after the application that needs to display the floating window to allow the application to use the floating window permission.