Good evening Patricia and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
I’ve installed the free version and on the mobile device in the vertical format, the calendar entries are squished and unreadable.
This might be due to some competing CSS rules from your WordPress theme.
Before anything else, I would recommend experimenting with the settings found under Events -> Settings -> Display to see if that helps.
If it does not, would you mind sending a URL to your calendar so that I can take a look and see what is going on?
Best regards,
Geoff B.