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The Widget Visibility app allows you to configure widgets to appear (or be hidden) only on certain pages.
Setup & Usage
Once you've activated the Widget Visibility app you'll find a new button on individual widgets enabled on your site (under the "Appearance > Widgets" admin menu, or under the "Widgets" section of the Customiser) allowing you to configure that widget's visibility options.
Visibility is controlled by five aspects: Page type, category, tag, date, and author. For example, if you wanted the Archives widget to only appear on category archives and error pages, choose "Show" from the first dropdown and then add two rules: "Page is 404 Error Page" and "Category is All Category Pages".
You can also hide widgets based on the current page. For example, if you don't want the Archives widget to appear on search results pages, choose "Hide" from the first dropdown and then add "Page is Search Results".
Each visibility rule is handled separately. There isn't a way, for example, to only display a widget on posts that are categorised as "Summer" and also tagged with "Picnic".