One option is to put all your articles in another section with a different layout. Otherwise, if you are going to leave your articles in the same section, and thus using the same layout, you will need to create a custom template for the widget (enter the template name on the Configure screen) and put a condition around it to only show it on the first page. Or, if this is a php widget, then you can just use php to do that. What you do depends on the type of widget you are using.
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