You need to distinct two objects:
1. ScrollView, which is a vertical scrollview you can add in the Deisigner. You cannot add any views directly on it in the Designer.
The height of the ScrollView must not be heigher than the screen, otherwise not all the content will be displayed.
2. ScrollView.Panel, which is the internal Panel of the ScrollView. You can load onto this Panel any layout like in any 'standard' Panel.
The height of this Panel can be any value and of course heigher the the screen height.
But you need to set this height with ScrollView.Panel.Height = xx.
You may have a look this example:
ScrollView example with a Panel higher than the screen.
You can, of course, also use xCustomListView which is a much more versatile view based on a ScrollView.