Microsoft Booking - blocked slots colour amendments

Dear team,
Could you advise if the colour for blocked slots in Booking calendar ( outlook.office.com/bookings/calendar )  can be changed at all, please? It is almost the same colour as the available slots which makes it extremely difficult to distinguish between blocked and available. I have been told this setting is default but I am sure there should be a solution. Any help is appreciated.

Here is an example of blocked slots on the top and available underneath.

Thank you very much in advance