For other people looking for this: there’s a feature request here you can vote on to raise the priority. In the meantime you can opt to use Calendar Plus to display a start and end date.
Hi Everyone, You’re invited to try our most advanced calendar app! Display your items as calendar events with customizable start and end times.
Plus, you’ll find many more configuration options to customize your experience.
check it out: https://auth.monday.com/marketplace/listing/10000472/masterplan-calendar