The amount of details that you can see, partially depends on the time slot itself, your screen size and version of Outlook.

There is indeed a way to show you the appointment details when you enable AutoPreview for your view. Is there anyway to fill this space with some more meaningful info such as the notes I wrote in the appointment? Now some of my longer appointments are just big blobs of color. I’ve adjusted the time scale in the Calendar (I’ve set it to 15 minutes), so that my work time hours completely fill the visible Calendar area on my screen.