How to adjust and delete the number of items recently used by Mac

to modify the number of "Recently used items" in the Mac system:

This is the original picture, in the upper left corner of the small Apple after you can see what recently used, at a glance, at the bottom of the menu to clear the function, but we should not be able to remember every time to press.

To change the friend, first enter the system preferences. Again into the "General".

At the bottom you can find the most recently used items, choose to display a few, or choose "No" will not show, go to the bad things you do hide it. @@facesymbol@@‖∣

In fact, we can also use a series of cleaning software and optimization tools like Dr.cleaner or macbooster to protect our privacy.