How can I sync and organise apps on iPhone from Mac? Is there a macOS app to manage and organise apps on iOS? Apple used to 
have this as part of iTunes but since they have dropped that feature there doesn't seem to be any real alternative to manage all those iPhone apps into separate screens and a manageable order.
You can use the free app Apple Configurator 2 to organize apps.

Once the device is connected, right-click > Modify > Home Screen Layout:



Then you can manipulate the apps, folders and home screens as you could in iTunes.



Configurator has plenty of of neat features, especially if you manage other people's iOS devices.