Good morning Karen and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
What is going on is that, based on your screen size, there are too many columns activated under the Events list menu in wp-admin. As such, these columns are fighting for space.
The solution is to deactivate unnecessary columns by clicking on Screen Options in the top right corner of your screen (see screenshot). Once that is done, simply remove the checkbox of undesired columns until the problem disappears).

Let me know how that goes.
Best regards,
Geoff B.