Xero is great for add-ons. It's eco system of quality apps helps you create your own mini ERP system. But sometimes, less is more. In the case of Zahara, you have four applications in one (4 in 1).
Once connected, a full sync of Xero data can be triggered from within the Integrations section within Business Settings. To sync just one element (Suppliers/Nominals/Etc), head to the corresponding area in Zahara and select the Xero Sync button. This will trigger a sync of that one element.