Unable to change theme that applies to view
To use a different theme for a specific page, try the ThemeKey module. It allows you to define rules for automatically selecting a theme. You can create a rule to switch theme for a particular path, which is probably the one you want. Another useful one is to select the theme based on the user's role. For example you can test theme modifications on a production site by showing one theme for anonymous users and your work-in-progress theme for the administrator role