How can I adjust the curve of a barrier?

Hey, so currently I'm trying to do an underwater viewing area with curved glass barriers. And I know it's possible or at least it was possible to adjust the way the barrier is curved but can't figure it out anymore. I thought it was "Z" as a shortcut but that doesn't work. Can someone please explain me how this is possible again?

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So, I want this glass fence to be curved but the other way around.
 
I'm not an expert with curved barriers because it's much more pain to get the ideal curve. Holding z seems to do nothing so my method when I do it is make 2 curved barriers and adjust the center one. If the curve is wrong then delete both and try again, hardly an efficient method and most likely my pain of curved barriers comes from the way I do them
 
I'm not an expert with curved barriers because it's much more pain to get the ideal curve. Holding z seems to do nothing so my method when I do it is make 2 curved barriers and adjust the center one. If the curve is wrong then delete both and try again, hardly an efficient method and most likely my pain of curved barriers comes from the way I do them
Thank you but I've definetely seen it a few times in Youtube videos that some key/shortcut was pressed and then that green cycle apperead and the curve was adjusted.
 
Thank you but I've definetely seen it a few times in Youtube videos that some key/shortcut was pressed and then that green cycle apperead and the curve was adjusted.
I also saw on the steam forums that pressing z flips the barrier, confusing that it does nothing ingame
 
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