Although Dashboard is disabled by default in Yosemite, Apple has elected to provide an easy to use System Preference option to enable and disable it — no need for Terminal commands here!If you’ve just installed Yosemite and want to enable Dashboard, head to System Preferences Mission Control.In case you’re glancing at your Safari toolbar wondering what I’m talking about, it’s not visible by default.
Apple first started disabling the Dashboard by default in OS X Yosemite and hasn’t even updated the feature in several years.
In order to view any of your Dashboard widgets while in this mode, your screen will slide to the left to view the Dashboard space.
As Overlay is the “traditional” Dashboard view, which dims your current desktop and brings your Dashboard widgets down on top of the window.
Apple disabled the Dashboard by default yet again in OS X El Capitan.
Here’s how to enable it and get it back just like before.