You just need to wipe the data cache partition. You do this by turning your phone off. Then do a hard boot by pressing and holding down the Bixby button, volume up, and power all at the same time. Continue holding until blue screen comes up. Then you will see a list of commands. Use volume down to navigate to "wipe data cache partition". Use the power button to select "wipe data cache partition". When it completes, use the power button to choose "reboot". This will fix the issue.
