macOS Sierra: Login Items pane of Users & Groups System Preferences

List of items

Items that open automatically at login.

Hide column

If you don’t want an item’s windows to be visible after login, select the Hide checkbox.

This option has no effect on server connections; server connections always appear in the Finder after login.

Item column

Icon and name of the app, document, or connection that opens automatically.

Kind column

Type of item (app, document, or folder.)

Add and Remove

To have an item open automatically at login, click the Add button on the right, then select the item.

To stop an item from opening automatically, select the name of the item, then click the Remove button  on the right. For more information, see Delete a user or group.

Action

See About the master password.

Lock

Locks or unlocks Users & Groups preferences. Click the lock icon to unlock it, then enter an administrator name and password.