One of our common workflows on Dropbox was

• Move large file to the (Dropbox, now Box) folder
• Wait for (Dropbox, now Box) to upload that content to the cloud storage
• Right-click on the file and select an option to force it to "Online Only" mode, which would remove the local copy, freeing up the disk space

It seems that there is no way to do that last bit with Box Drive, and there absolutely should be. For many folks, the premise of cloud storage is "get this off my local disk", and waiting until some random cache times out days later isn't a good, viable, option.

Right now the only option seems to be the very-kludgy "log completely out of Box" (which is a broadsword solution to a problem that deserves a scalpel).