How to Change the Screen Resolution on a Mac

Part 1 of 2:

Changing the Display Resolution

Click the Apple menu. This is located in the upper-left corner.
Click System Preferences.
Click the Display option. If you don't see this, click the Show All button at the top of the System Preferences window.
Click the Scaled radio button.
Double-click the resolution option you want to use. Selecting a "Larger text" option is the same as choosing a lower resolution. Choosing a "More space" option is the same as selecting a higher resolution.^[1]

Part 2 of 2:

Opening an App in Low Resolution Mode

Quit the app if it is already open. You can do this by clicking the app name in the menu bar and selecting Quit.
1. You may need to enable Low Resolution mode for apps that are not displaying properly on a Retina display.
Click your desktop. This will make Finder the active program.
Click the Go menu.
Click Applications.
Click the application to highlight it.
Click the File menu.
Click Get Info.
Click the Open in Low Resolution box.
Close the Get Info box.
Double-click the app icon to open it. The app will open in Low Resolution mode.^[2]

click resolution app open

Jessica Tanner

Update 04 March 2020

You should read it