When a product need some settings synced, it will be prompted in red.
During sync, you will be informed of progress of the elements synchronised with the device.
After all elements are synced, the "sync" button becomes a checkmark information.
If you select to update all devices in range, then the app will sync all of them and yu should wait to have the checkmark for all devices.
Please note: Wi-Fi credentials ( in the 'connectivity' step ) and the 'sync products' step are required before the handover of the project to the client. If these steps are not complete and a project handover is executed, the client will not have control over the WiZ devices.