Calendar Creator 10 Deluxe event overflow at end of day?

I’m using abysmally old calendar software at work, Calendar Creator 10 Deluxe.

It allows the user to “box” an event (typically a one-day event, making a block of color in the hours the event takes place) or “banner” an event into a narrow band across several days.

The calendar can display the hours in the workday and one could then block out events in those hours.

BUT…when an event ends at the end of the workday, it is always collapsed into a little arrow indicating “overflow” and not displayed. For example, if the workday ends at 4 PM, an event running from 2:00-3:30 will show up, with a half an hour “unused” between 3:30 and 4:00…but if I extend it to 2:00-4:00, the event disappears and is replaced by the little arrow.

I realize this is outdated and feeble software, and that requesting help is a longshot (Google found no blogs or chats on the topic that I recognized). But this is what my employer is currently using. If anyone has any helpful hints, would you please share them?