As far as I’m aware, you can only delete personal folders via the API - you cannot do this in the web UI.
I deal with this by following an offboarding process:
- If an employee is being offboarded, I check whether they have any content saved in their personal folder.
- If they do, and it has not been viewed by anyone else in the last 90 days, then I delete it.
I have a dashboard based on the System Activity Explorers that quickly gives me this information when I filter it for the specific user. I appreciate this manual process would be unacceptable if you have a very large instance, with 1000’s of users.