Undo a Card
Sometimes you want to undo a card grading you have just given. This can be useful if you accidentally graded a card wrong or if you changed your mind about the grading. Or, you might have hidden a card accidentally.
Fulfill this task
To fulfill this task, you need to undo a card grading. Tap the "Hamburger button" on the top right. Then, choose "Undo".
If you cannot see the option "Undo", you first need to grade at least one card.