where are the setting or option in cloud orchestrator to migrate from classic to modern folder ?
No such setting bud, you need to migrate them manually or use a third party tool. The UiPath Orchestrator Manager has functionality to help do this, you can find it in the Uipath Github.
Welcome back @adi.mehare!
Have a review of one of my other replies related around Classic to Modern Folder Migration. Orchestrator Manager - RPA Component | UiPath Marketplace is most likely your best pre-built method to handling Migration of Entities between Folders in general.
Do take note the comments on how Credential Assets are managed and that it is not possible to handle Per User/Robot Credentials. Do read over the Orchestrator Manager Manual.pdf
included in the download before preceding.