To change the screen resolution on a Mac, open the Apple menu → click System Preferences → click Displays → choose a Resolution option → choose the resolution or scale you want.
Part 1 of 2: Change your screen resolution
Step 1. Click on the Apple menu in the upper left corner
Step 2. Click on System Preferences
Step 3. Click Monitors
If this option is not available, click the Show All button at the top of the System Preferences window.
Step 4. Click on the Scaled radio button
Step 5. Double click on the resolution you want to use
Selecting the Larger Text option is the same as selecting a lower resolution. Selecting More Space is the same as selecting a higher resolution.
Part 2 of 2: Open the app in low-res mode
Step 1. Exit the application if it is already open
Do this by clicking on the application name in the menu bar and choosing "Finish".
You may need to turn on low-res mode for apps that don't display properly on a Retina display
Step 2. Click on the desktop to make Finder the active program
Step 3. Open the Go menu
Step 4. Click Programs
Step 5. Click on an application to highlight it
Step 6. Open the File menu
Step 7. Click Show Properties
Step 8. Click the Open in Low Resolution button
Step 9. Close the Properties window
Step 10. Double click on the application icon to open it
The app will open in low resolution mode.