I second this request and opt to have it locked by default. My students move it all the time and they dont realize what they are doing. Or a least a prompt "this is what you have just done, here is what happens"

It causes no end of repetition and they never get it.

Please change the request.
I know why it's there but not everyone needs it and it's annoying having a line cut across the page every single time.

Still, good to know how to disable it in the meantime.
Thanks.

Hey Elaine, you're right, that does disable the fold line - thanks for clarifying. Is there any way to set Scrolling to none for all future artboards?

It is there just to denote that when you publish the preview, any size larger than the original template size will be outside the viewport (and as such require scrolling to view).

You can either as Cristian points out, just draw your own artboards if you don't want the formal device centric artboards - or set Scrolling to 'none' in the PI.

One workaround is to not use the template creator, because if you create an artboard by yourself, there will be no fold line.