Thank you for you comment and sorry for the late reply. =(
I've tried moving cardAdjuster out of the ScrollView, and two parts are displayed separately in the Canvas.
Also, I've figured out what caused the issue. It's mainly because of the preview code in Xcode. Pls refer to my reply due to characters number limit. Tks!!!
RoddySu
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Tks for your reply but it didn't work=( The cardAdjuster would just be displayed separately.
I've figured out where the problem is. Pls refer to my comment below due to character number limit, thank you!!