When the mobile phone receives a text message, the flash will light up. How to turn off this function?

Some Samsung mobile phones support the flashing notification function. If this function is turned on, when you receive a notification (such as information/incoming call), the flash will light up and flash. I suggest you verify whether your mobile phone supports flashing notifications. The mode is: Settings-(My Device)-Accessibility-Monitoring-Blinking Notification. If you need to cancel, just cancel the check mark.