Is there a way to remove Public Group content (such as blog posts /forum topics/TKB articles) from the Community's main activity?
You could consider using this setting 'Hide messages in this board from lists' in Admin/Structure which you can apply at each individual board level under your Group Hub. I am unsure how this would then impact your Group Hub top level page as it may hide board activity from the main feed on the Group Hub landing page which might not be what you want.
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