By Default, the calendar is set to 1 hour space intervals and has a light font shading on the colors of the appointments. To adjust the size of the text and the boldness of the appointments, follow the steps below:
Open up the Options Window by selecting the options button.
Select the Time Interval to be either 30 mins of 15 mins
This will make the appointments to be bigger and the text to be larger
At the bottom of the menu, tick the slider option to enable the appointment colors to be bolder with brighter colors
When enabled, the calendar will reload with larger font size and brighter colors