Here is I found form John Dandison’s blog for how to remove the Recently Modified sections.

14 folder (program files\common files\microsoft shared\web server extensions\14\template\DocumentTemplates) , open the wkpstd.aspx file and find the ‘SharePoint:RecentChangesMenu’ control. You could probably delete it, but being a server control, I figured just slapping a visible=”false” on the end of the tag should work. Added visible=”false”, saved the file, and refreshed my page – sure enough, no more ‘Recently Modified.’