About the icon in the upper left corner, I guess it may be an icon indicating the current connection state between the watch and the mobile phone. Specifically, if this icon is a "√" symbol, it means that the current watch has been successfully connected to your mobile phone; If it is a flashing "×" symbol, it may mean that you are currently trying to connect to your mobile phone, or there is a connection problem.
Of course, this is just my guess. If you have any other questions or questions, please refer to the official manual of Huawei Watch or contact customer service for consultation.