Hi @MP68, let me see if I can help out here.
Safe mode is a troubleshooting mode that is most often used in order to see if a downloaded app in the phone is malfunctioning. You can read more about safe mode here.
In order to exit safe mode, just restart your phone as you usually do it. If that does not help, make sure that the volume button works as intended and that the volume down button is not pressed while starting the phone.
Let me know if that helped! 
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