Scheduled tasks Add user dropdown
When logged in with the main admin/root account click in the right hand column on "Scheduled Tasks" takes me to the Cron jobs that I can setup.
There is no indication as what system user will run the task? This has cuased a couple of my crons to fail and struggled to find the issue.
Eventually I found I needed to under Main nav - Server tab then to Scheduled Tasks.. this takes me to the users lists that I can set cons for specific users.
Very confusing!

In Plesk 12.5, you can select the system user while creating a scheduled task. A drop-down menu was added for that purpose.
Note: You can specify a system user only for server-wide scheduled tasks, but not for scheduled tasks of a webspace (subscription). The system user of a webspace is used to run scheduled tasks of a webspace, and that user cannot be changed.
—ES