Using Eistein Capture with Google Agenda : how to select only a few calendars to synchronize ?

Hi all, 

I'm struggling with this one... 

I am looking for a solution that might help us to synchronize internally shared Google Calendars used by our employees with ou Salesforce Calendar but only for a few selected calendars that are related to our social activities, and not the others (specially not the personal ones). 

The need is that an event that would be modified in the Google Agenda, would also modify the Salesforce event record. The event could be modified by many diferent users. 

I thought I might be able to achieve this using the standard Einstein Capture Activity, but I don't see how I can select the calendars that I wish to synchronize with Salesforce.  

Also, I would like to know if it could be enough that one user synchronize the shared Google Calendars for that all the events are synchronized with Salesforce. Or do every user need to synchronize them in order that the events they would create or modify in those calendars would be syncrhonized as well. 

Thank you for your answers !