If you need to disable the reminders for all shifts – maybe while off sick or on extended leave – you can do this in 2 ways:

1. Tap on the “Bell” button at the bottom-left of the main screen
2. Tap on the Calendar icon in the top-right to show the calendar menu. Tap on “Set Reminders” and turn off the switch at the top of this screen

To turn all reminders back on again later, just reverse this process. Note – turning reminders on or off like this DOESN’T lose any reminder settings on individual days so you don’t need to set them all up again.