The vision of the Roon principals does not include folder management. A decision most of the subscribers agree with as it would change the nature of the product. However, much controversy swirls around this.
https://community.roonlabs.com/t/music-file-management/37507/79?u=slim_fishguttz
Hope you’ve backed that collection up and stored off-site. A house fire or burglary would really ruin your day.