OS X El capitan, i realised that i can not see any recent projects especially in the Xcode. Then i made some search and i found that i could change that option from the System Preferences. When i change the recent items count from none to 5 for instance, when i close the preferences window and go there again i see that the items 5 has changed to the none option again. I tried some of plist file deletions from the Library/Preferences i saw in some sites but it did not help. I am not able to find any solution for that. So how can i change this option permanently?
According to this answer go with this steps:
Open Terminal and execute command
rm ~/Library/Preferences/com.apple.recentitems.plist