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If you enable the ability for your employees to drop shifts, then they will see an option on each shift which they can use to "drop" the shift. Once they click on drop shift then what happens next is based off the workflow options you select now. They
Notifications
There are a couple of settings you can use with regards to notifications about dropped shifts.
1-Alert scheduler when shift flagged as dropped - The scheduler(you?) can be notified every time a shift is dropped. You can choose this option but consider how many times you might get notified, it might make more sense for you to just use the filters inside Schedule Xpress to look for dropped shifts once per day or so. Use your best judgment.
2-Alert Employee when drop was cancelled by scheduler - This is a notification that can be sent to the employee if you reject their drop request. This can give the employee a heads up. It is still recommended that you tell your employees to pay attention to their schedule to see if they still need to work a shift.