Lock screen notification panel

Go in settings, then lockscreen , then notifications, then select Icons only. Then you will see only icons on the lockscreen of notification not the exact notification. If you want detailed notification but locked type , then select hide content

Unfortunately, No
it's a core feature of Android itself, you cannot disable it

But you can use lock networks settings
By doing that no one can on/off any networks settings without unlocking the phone
To access this settings follow this steps:-
1)Open "Settings App",
2)Click on "Lock screen ",
3) Click on "Secure Lock Settings",
4) Enter your password/Lock pattern/pin,
5)Click on "Lock Network and Security".

For Hide All Notifications while Screen is OFF.
1. Go to Setting and open "Lock Screen "
2. Find "Notifications " in Lock Screen Section.
3. Turn OFF Notifications option.
Please Find Screen Shots

Phone which came under 10 k also get the option to not allow anyone to access the quick pannel if screen is lock where samsung phone which are count in premium sections don't have such function.totaly disappointed and moving to some other andorid phone .

Company should value the customer money and value which we are giving to samsung