Events Manager Calendar displays line 1 pixel wide

this can be changed using your theme style.css and you can use browser eg. chrome to inspect elements and get it’s css class or id name.

Thanks, I remember having to do this for event espresso:

#espresso_calendar a {
max-width: none;
}

Now I just have to find the right wording for Events Manager

I have asked the question on the WP_Fullcalendar page also.

Can you post a link to the calendar?

Yes, the page is: https://urbanhealing.net/calendar-test/
Click forward one month to September to see what an event looks like.

you can try to add this at the end of your theme style.css or in your theme option custom css

a.fc-event {
min-width: 86px !important;
}

Thanks Angelo, your code works with a small change to max-width: none