1.Open Theme Organizer.
2.Add a new theme with Root->Page->Display->View Mode.
3.Set it to Window. //Note: This is the only window view related property i found. There is no property under Miscellaneous node.
4.Set it as System theme.
5.Plot a scatter graph.
--> It looks the graph is in window view.
==> Resize it, the square data symbols show as oval, text distorted, etc.
==> page.viewmode = returns 3. Or page -vnw nnn;nnn=; nnn returns 3 as well.

Fixed in Origin 2021.