Using the Wiki Display Widget
Wiki is deprecated as of Liferay DXP 2024.Q4/Portal GA129. For data continuity, consider transitioning to alternative content management solutions like Liferay Objects or Web Content.
Users can use the Wiki Display widget to highlight a specific wiki page regardless of whether it is a top level page or a child page. To use the Wiki Display widget:
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Navigate to the site page where the Wiki widget has been deployed. 
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Click Add → Widgets. 
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Expand Wiki.  
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Drag and drop the Wiki Display widget to the desired location on the site page. Note that unlike the Wiki widget, multiple Wiki Display widgets can be deployed on a page.  
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Click Please configure this portlet to make it visible to all users. 
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On the Setup tab, select Main from the Node dropdown menu. 
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Select the wiki page from the Page dropdown menu. Wiki pages can be either a top-level page or a child page.  
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Click Save and close the window. 

The Wiki Display widget now displays the selected Wiki Page.