March 19, 2013, 3:58 PM — Here's how you can get a free app that will add a display icon to your menu bar. This will let you choose the screen resolution of your Mac.
1. Go to the Display Menu preview page.
2. Click the View in Mac App Store button.
3. Click the Free button to download and install Display Menu.
4. Click the Display Menu icon in your menu bar to change screen resolution.