I’ll cut to the chase: the window isn’t wide enough. Either maximize or stretch the window’s width and the subject will display. You’re welcome, feel free to buy me a cup of coffee. 😎 →
This had been driving me nuts for a few months, but it was sporadic, only happening once in a while and only to (seemingly) random appointments. This morning, I got tired enough of it to figure it out.
I’ve been working with Outlook for over a decade and this had never happened before. How and why now? Was it some sort of bug in Outlook? or was it something different or new that I’ve been doing?
It was something new I’ve been doing.
I recently bought a third monitor to make online meetings easier when instructing groups.
One monitor displayed my presentation, another displayed the Brady Bunch grid of faces and the third monitor, in portrait mode, allowed me to watch and manage the waiting room, the chat and the breakout rooms. It’s worked out very well, not only for online meetings, but for my tendency to have…more than a few windows open at one time.
As a matter of everyday practice, when I’m not in an online meeting, my middle monitor is my main monitor. Straight in front of me, good ergonomics…all that. My left monitor is for reference or source material and my right, portrait monitor became home to my Outlook calendar and email.

I typically don’t have outlook maximized because, as you might have guessed, I use the bottom half of the portrait monitor for another window, often youtube or amazon music.
My default view for calendar is month view and I’ve been noticing that some of my appointments didn’t have a subject line. It happened again today. Weird. I opened the the appointment to see if it actually HAD a subject line. It did. Weird. I googled. Lots of search results about scheduling resources and…what you probably found before you stumbled upon this post.
I figured it out when I dragged my Outlook calendar to my middle (landscape) monitor and poof. Subject line appeared. Here’s a screenshot of it happening last month.

It reminded me of a previous Pragmatic Computer Tip about Excel spreadsheet cells displaying pound signs because the cell wasn’t wide enough.
I dragged Outlook back to the portrait monitor and double clicked the title bar to maximize the window. The subject line appeared. Since I didn’t want to leave the Outlook window maximized and taking up the entire height of my monitor, I restored the window and then stretched it a bit. The subject line appeared.
If you notice, the times for the problem appointment have two digits in both the beginning and ending times, making it longer than the other appointments. That was enough to do it.
Annoying problem solved. I need coffee.