Roots
Folders whose projects are listed. Hiding one leaves its sessions running; it only leaves the list. Adding one is an edit to the config file on the machine.
Stopping
Agent plugins
Refreshes the agent's marketplaces and updates every plugin installed for your user. A plugin installed for one project is listed and left alone. An install command a marketplace declares is approved without being shown to you first.
This instance
Set on the machine, in the config file or on the command line, and shown here so you do not have to go and look.