Allows you to perform actions for multiple shifts in one go - you can copy multiple shifts to another person or time period, accept multiple shift applications or delete shifts in one go. When the Select Mode is ON a blue bar appears on the calendar and if any shifts are selected the possible actions will show on this bar.
It allows you to filter select employees and manage their particular shifts. Once you are done with editing just switch off the select mode to see all your employees and full calendar view.
The "Tools" section is accessible from the "Schedule" tab.