Are the new calendar event visuals reversible?

Hello ,

Recently there has been a change to how calendar events look , is this action reversible??? I have reverted my app back to even version 7 but still no change. Before calendar events could be put with a full background of a specified color , but now this background has transformed into a little dot of the specified color.

I was hoping to have it the old way as it works better.

Q = How to revert to old visuals for calendar events.

Thanks for you help and time.