Currently the Team calendar does not offer a way to easily filter the events based on legends. Incase a user needs to see only a single type of events , the user is required to either deselect all the previous selections

For instance , in the above case , if the user only wishes to see the "travel" events , he has to first deselect the "Leave" and "birthday" events 

As an enhancements we can either introduce filters or a checkbox that allows a user to select or deselect all events in one click

Another scenario for the same issue is when there are multiple Calendars on the same page. Selecting or Deselecting a legend on one calendar does not impact the other , as a suggestion, provide option to select or deselect all event in each legend