There are two sections within HRWize that contribute to the colours of the items shown on calendars and planner.

1. Time off types located under:

Administration > HR > Timeoff management > Timeoff types 

Each of the individual time off types can be colour-coded when adding a new time off type, or by editing an existing time off type. To see more information about adding or editing a time off type, click here.

2. Other calendar and planner entries located under:

Administration > Company > Options > Calendar options 

Other calendar entries include items such as Events, Reminders, Birthdays, Training dates, and so on. These are controlled under calendar options. 

Other calendar entries include items such as Events, Reminders, Birthdays, Training dates, and so on.

Additionally,  in the calendar options, you might want to reduce the number of items displayed per day to say, 4 or 5 entries. This way, if you have 10 employees on holiday across your whole company, the calendar for that day will not stretch too long and look unsightly, as there will now be a "Maximum calendar items per day" option that will allow you to limit how many entries appear on a given day.

While this makes for a much better user experience, it would be worth drawing attention to this with new employees or for those who haven't received system training so that they don't miss anything on the calendar. 

These will then reflect within the Calendar and the Planner.