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Query : How would i be able to see changes in the Design View inside VS Editor?
We have checked your query and observed that you want to see the changes of TabNavigationControl at design time. In order to do the modification of the TabNavigationItem, you can use the Property window and you can change the selectedindex of the TabNavigation control as shown in below screenshot:
By using this SelectedIndex property , you can able to toggle your desired TabNavigationItem and do the changes as you needed. Or else, you can set the desired node as first TabNavigationItem and you can change the properties for that Item respectively.
Please try this solution and let us know if it is helpful.