Hi,
Thanks for reaching out to us! I’d be happy to help you 🙂
There is no setting to modify the size of the hover box on the calendar, however, you could use some css in order to customize it. The class you are looking for is .tribe-events-tooltip.
For instance, you could add in Appearance > Customize > Additional CSS the following snippet:
.tribe-events-calendar .tribe-events-tooltip {
padding: 40px; // or any other dimension that would suit your calendar
}
I hope this helps.
Cheers,
Jeremy