Smart Sync for PC - how to sync S Planner calendars OTHER THAN 'My Calendar'?

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Smart Sync for PC - how to sync S Planner calendars OTHER THAN 'My Calendar'?

After much irritation, I now realise that Smart Sync for PC will only sync calendar entries to my Outlook if they are created using the 'My calendar' account.  How do I

1. Make all calendar entries sync properly or at a minimum

2. Ensure that the default for all new entries are 'My Calendar' and not my Google/Samsung account?

As a bonus, why does it seem to be impossible to set event colours for 'My Calendar' events?  Every event seems to have to be the same colour.