Vital KM
"My Subscription" and "My Subscribed Documents" explained

My Subscription:

1. Can be used to subscribe to folders, categories and documents.
2. Users cannot override a manager’s subscribed items that appear in their “My Subscription”.
3. Manager also cannot remove a user’s subscriptions.

My Subscribed Documents:

Once subscribed to for three days, the items will show up under “My Subscribed Documents” where they can be [Set as Read] or be deleted from the subscription list by clicking [Delete].

"My Subscription" and "My Subscribed Documents" explained. (Please refer to FAQ.)
https://faq.vitalyun.com/EN/Knowledge#917