I found the same thing as @Tim Wijnhoven where you can drag to select a time block and hit enter or start typing to create the event.
Unfortunately, this means that if you want to create an event in another calendar, make a private event, categorize a new event, or really change anything other than time interval and title, you have to either do so from the New Event button (where you can't use the convenient click-and-drag time blocking) or click-and-drag to create the event and then re-open it to edit it.
Edit: this issue persists for me on the app and in the browser version.