Cannot unset Rota/Schedule Job from showing in calendar

Hi,
I’ve just created a calendar event from the rota screen. When looking at it on the calendar, I noticed it shows the detail of who is doing what. Whilst I recognise that could be useful for some, I don’t want it, so I have tried to uncheck the check box on the relevant rota job – but when I click “Save” it just comes back ticked – so always showing on the calendar.

Please help so I can remove it.

Many thanks