Minecraft Badlion client clear view?

I have already seen with some yt videos that you can enter a kind of unobstructed view in which you can run straight but can move your camera without the character changing the direction. I looked around in the badlion settings but would not have found it if someone could tell me where to set it.

Is weird does not work on every server

Try to hold down the "Alt" key in the single player

Press the right shift key, select "Mods" and switch on the mod "Perspective".