This should be built into the program. There’s no reason why anyone would want to keep those synchronized across computers.
I apologize for that, you can unsync them using the selective sync feature within Drive: https://support.insynchq.com/t/how-to-selectively-sync-google-drive-folders-and-files/31/1
Actually that doesn’t work. If I try to unsync them then Insync tries to delete them locally, which is not allowed by the OS.