@Dawn D: That's strange. Typically it should be possible to exit Safe Mode by restarting your phone as you would normally:
1. Press and hold the Side Key > Select 'Restart' via the Power off menu that appears on screen.
2. Swipe from the top of the screen to the bottom, then again to enlarge the Quick Panel > Tap the Power button that appears in the top right corner > Restart.
If the issue persists, check to see if your Volume Down button is sticking in place, as this can also cause the phone to boot in Safe Mode. Let me know how you get on.
