As always, Apple loves to add extra effects to the user interface of its applications and programs, and in the case of recent versions of OS X Yosemite and El Capitan, the sidebars and title bars of windows now have a transparency effect, which allows you to see a little through them.
While many users find this effect appealing, a significant number don't. Fortunately for them, there's a simple way to disable it. The only change when you turn off this effect is that the bar interface will no longer reflect the colors of the elements behind it. However, it's worth noting that, like many other effects Apple adds, disabling the transparency effect can considerably improve your Mac's overall performance.
