delete the notification and a new one will be received if the underlying resource (issue, pull request, project, ...) is updated
unsubscribe the notification, it is deleted and no new one will be received unless a new mention appears in the underlying resource
snooze the notification to make it disappear until the next day
create and plan a task in the connected task service (Todoist for now)
associate the notification to an existing task
2 ways synchronization: Universal Inbox tries as much as possible to keep its notifications state in sync with the upstream service. The upstream service API does not always permit it.