Click on "View" in the top left of your screen and select Zoom in or Zoom out. Alternatively, you can hold the “cmd⌘” key on your keyboard with either the + or - symbols at the top of your keyboard to zoom in and out. 

Zoom 100% is the default screen size. Click Zoom out or cmd⌘ and "–" on your keyboard to zoom out and achieve more vertical space. The image below is 90% on a 15 inch laptop screen and shows hours 9am - 5pm

Click Zoom in or cmd⌘ and "+" on your keyboard to zoom in and make everything bigger including text size. The image below is 120% on a 15 inch laptop and shows 9am - 2pm: