When the Schedule interval is very small like 1, 2 or 5 minutes .. the text is not visible.. Improve responsiveness of Labels by adjusting padding in small intervals or decreasing the font size to keep it visible.
Make sure UI don't mess up with smaller time intervals

And UI Overflowing Issue .. Make it horizontally overflow like the days bar if more than 3 events occuring on the same time...

Keep the red and green marks horizontal like flex row .. can make them small as well
