well i know that it is not what you want but that's all you can do.
Btw, i am also aware that sometimes it even hides the collapse/expand pointers.
But, usually when you reload the page it shows up them again.
Means, to answer your question, VS (design view) doesn't support Regions. Unfortunatelly.
When you ask a question, remember to click "Mark As Answer" when you get a reply which answers your question.
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