Step 1. Turn the device off by holding the Power button until the option to Power Off appears on the screen. Tap Power off.
Step 2. Press and hold the Power and the Volume Down buttons at the same time, to turn the device on. When you see the Samsung logo appear on the screen, you can let go of the Power button while the device boots up. Make sure to keep holding the Volume Down button.
Step 3. If done correctly, 'Safe Mode' will display on the bottom left corner of the screen. If 'Safe Mode' does not appear, repeat the steps above.
Step 4. Once you're in Safe Mode, you can remove the third-party app that is causing issues on your phone.