Is there a way to change this highlighted section to match my own working hours? Luckily, there are some workarounds which could help you out. Meaning, the appointment has to span at least 2 lines of your time scale. Hovering on the appointment in Outlook and Outlook shows more details with AutoPreview turned on. The appointment has to span at least 2 lines of your time scale to show some of the body text, or 3 lines when you have a subject set.