Can you choose which files should exist only in iCloud?

I was about to run out of hard drive space (only about ~5GB left out of 250GB). So, I decided to start using iCloud to back up my Documents and Desktop folders/files because it is supposed to automatically start freeing up space on your hard drive after your files have been uploaded to iCloud by only keeping the most recent files.

I'm about a day in so far and the backup is only about 1/3 complete (~80GB). However, I'm still at 5GB of storage space left. So, it seems that the "automatic" process to free space has not yet started.

So, I'm just wondering: Is there a way to select folders/files that have already been uploaded to iCloud and manually set them to "iCloud only" instead of waiting for the "automatic" process to free up the space. I know Dropbox has a similar feature in "Smart Sync" where you can select "Online only" to free up space.

Thanks for any help.