You can change the default team from the Teams page (Organisation menu > Settings > Organisation > Teams).
Click on the pencil icon.
Select Edit.
Tick the Default checkbox. This will overwrite the previous default team. You can only have one default team.
Click the ‘Save and close’ button.
The organisation level Kanban board will open to the organisation's default team, and then you can choose other teams, as required. Synergy has created an 'All staff' team with all staff members attached to it and this is used as the default when setting up new staff.