Is there a way to adjust the width and or height of the Appointment + calendar widget display?

I have the Appointments + plugin and it really is amazing. I'm still learning all of the features. One thing that appears to be a bug or maybe my inexperience with the plugin, is the widget for the appointment calendar display size. I placed it in the sidebar of a couple of my sites and in each one it's too narrow and won't resize to the space. Is there a way to adjust the width and or height of the calendar's display?