Why does a lightning symbol appear on top of the user interface during "Live View"?

When you change the flash option to ‘Auto’ or ‘ON’ under Flash Mode in your Menu, a lightning symbol will appear on top of the user interface during Live View, which indicates that the flash has been turned on. When Flash has been set to ‘Auto’ or ‘ON’, the shutter speed will be limited and could cause irregular exposure. Therefore, please make sure if it is necessary to turn on flash. In cases where flash is not required, please change flash setting to ‘OFF’ to ensure proper exposure.