Microsoft 365 Roadmap
RM178292OneDrive: Admins can configure a group policy to block specific folders from OneDrive Sync
Summary
In addition to being able to configure a group policy to exclude specific files or file extensions from Syncing with OneDrive, admins can now exclude folders as well. End-users will be able to see the excluded folders in the Sync configuration applied to them via their OneDrive Advanced Settings.