Hide Recent Items in SharePoint 2013/Office 365 Quick Launch with Audience Targeting
Step 1: Create a new SharePoint Group called “RecentUsers”
Do not add any users into it.
Step 2: Modify the Quick Launch Navigation Settings
Go to Site Settings –> Look and Feel –> Navigation –> Current Navigation –>Recent <– Select Recent and click on Edit and in Audience add the newly added group “RecentUsers”