These settings control what type of warnings should be used in the schedule view within your organization. When the warning is fullfilled you will see it in the schedule view as a reda frame around the punch.
You'll find the warnings page in the menu on the left-hand side under Account settings > Agreements > Warnings.
Under each functionality, you'll see a grey text that describes what the warning does. To activate/inactivate a warning, simply check or uncheck the box under the activate column
If you activate Difference shift - Time and/or Difference time - Shift, a new input field will be visible where you can set the number of minutes the warning should use. Once you've added a value in the field, a green save button will be enabled. Click save to store the value.