There is a hidden App Lock Setting in One UI, you can enable it you lock your apps.Follow the steps in this website:https://www.infoclusters.com/enable-hidden-app-lock-samsung-devices/
Many users of Samsung Galaxy M series and A series are getting this issue of USB connector Notification and the fast charging is not showing when device is plugged to charge, it just simply shows cable charging.Steps to follow to get everything worki...
Follow the steps, it worked for me, maybe it will also work for you.https://r2.community.samsung.com/t5/Galaxy-A/FIX-USB-Connector-Problem-And-Fast-Charging/td-p/4930090