This forum post looks like a duplicate to the following one https://www.telerik.com/forums/radpageview-does-not-render-correctly-in-vs-ide
Let's continue the discussion in the other one.
For reference I am pasting below my answer:
Can you please perform the following test by removing all instances SkinsPath, EnableEmbeddedSkins and Skin properties from the markup?
After removing the use of the custom skin, the pageview2 started to render the controls inside it in the VS designer.
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