Why screensaver not happening automatically?

My Macbook OS 10.11 screensaver does not start automatically even if I put the screen turns off after 15 min. when plugged.  I want it to start automatically when the screen turns off.  Thanks for any information!

Here are my current settings SysPrefs/Energy Saver/adapter:

Can someone tell me how to set SysPrefs (or something?) so that the screen saver starts automatically, as it was in OS 10.8.6?  In response to another thread, <screen saver does not>, I found a suggestion to use the activity monitor to determine which applications can be set to prevent sleep (screenshot below) and found that AddressBookSourceSync has the value "Yes" (prevent sleep), but could not understand how set it up on 'No' or how to proceed after you have done this.  Also do not understand how "sleep, prevention, which is not the same thing as 'turn off display', is related to the problem screen saver.

If you clear the display you see not the screen saver. In addition, unless you check "prevent the computer from sleep...". "the computer will go to sleep.

Tags: Mac OS & System Software

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