The "Recent Content" widget on the Creo Overview page displays item activity from both the parent product community and nested sub-communities ( Modeling, Visualize, Analysis and Simulation, etc.) to give new members a snapshot of all the recent content related to Creo. The default view for this widget is to "'latest activity". You're correct that it's not correctly displaying the latest Product Ideas activity, and I'll follow up with Jive support to resolve (I know we have it turned on in the widget preferences, so I'm not sure what's going on here).
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The Creo All Content page provides a view of the content posted within that parent product community, but not the nested sub-communities. The default view for this page is base on "Sort by latest activity: newest first", and can be changed using the tools at the top of the page.
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We could replace the "Recent Content" widget with a "Recent Activity" widget on the overview page, however it would only display Creo community content, and would be a duplicate view of what you see in the All Content page. It provides content snippets instead of a list view, so maybe it's worth opening up a Product Idea to gauge interest. Again, the trade off would be that we can't display recent activity from the sub-communities with this view.
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If we were to initiate this change it would be across all product community overview pages so that we're providing a consistent browsing experience across all products.