You'll have to enable display scaling to get more of your screen's real estate of your in macOS. Follow these steps to change the screen resolution or scaling option;

1. Open System Preferences from the Apple menu at the top left of the screen.
   
2. Select Displays.
   
3. The default resolution is supposedly set here.
   
4. Click on the Scaled radio button and choose your preferred scaled resolution.
   
5. Below is a comparison between the default resolution and when selecting More Space option.