How do I increase display by 120% of normal? Using Mac Air, Yosemite OS In Windows one can right click, head over to display preferences and have the OS increase everything globally ... icons, fonts, etc ... by a certain factor.   It's really helpful for "old" eyes.   Is there an equivalent for Mac?   I have found zillions of places to tweak things piecemeal.  But am looking One place, One setting.   Am certain it exists, but as a Mac novice I have struggled. 

Am using Mac Air; OS X Yosemite 10.10.2
Use:

System Preferences -&gt; Accessibility -&gt; Zoom


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