A workaround I used is to set the focus to a textbox at the top of the arrangement. If you don’t use one, may be create an invisible one (set all colors to none and make it really small).
I also remember there’s an extension to change the position of scrollable arrangements, but can’t find it yet. Someone else has the link?
I did some test and found the suitable salutation to open a VerticalArrangmen on top of the screen is:
First set screen scrolling to false, than set AlignVertical to top which you must use 1 for it, than return the scrolling to true. ( AlignVertical does not work with scrollable screen ) as following: