Thanks for contacting us.
Unfortunately, our CMS cannot restrict certain themes to certain templates becasue our template editor has no security features. Your second feature is doable, but the user can still change the theme. Simply go into the template editor, select a template, click edit and then select a theme. When you make a new page, select the template and the theme will already be selected. For more info on using themes and our controls, please watch this video
I hope that I have provided a solution to your technical issue. Please contact us if you need further assistance.
All the best,
the Telerik team
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