Hide preview only on banner

I want to hide preview on banner that comes on top when we are using iphone.

As it happens we show photos or videos to other people, while doing so I do want to receive notification who msg me on what app, but I want the content hidden till I am click and hold it.

i do not see this setting, either it’s stopping preview all together.

i want to affect on the behaviour of banner and not the notification center on lock screen