To mark a student Absent first click on the Student Button and then click on Absent in the Action Bar. Marking a student Absent will prevent them from being included when using the Randomizer, along with being left out of the Select All option.
If you realize you marked someone absent accidentally, you'll get a few seconds to click on Undo.
To undo marking a student Absent after it's been submitted, simply click the Student Button again.
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