B4X FEED Designer scripts in the Visual Designer booklet

[practicalsoft]

I have a question about what's written in the Visual Designer booklet about designer scripts. In the example, it says that the right anchor for ScrollView1 is lost, so you need to use the SetLeftAndRight method. What I don't understand is why is the right anchor lost, and why can't you just use the Width method in the script, just like for ListView1? This is the screenshot of the relevant part in the Visual Designer booklet:

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