Going back over a lesson is a feature, not a risk. Your record only ever moves forward, so review freely.
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Open the Learn tab and find the lesson you’d like another look at. Completed lessons stay exactly where they were, ticked and tappable.
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Open it and work through the cards again, at whatever pace you like.
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Everything behaves as it did the first time: the explanations, the questions, the lot.
Step 3: a lesson in review works exactly as it did first time. -
Leave whenever you like. Your record is untouched: the tick stays, the scores stay, and nothing is ever marked backwards.
That’s the whole article, because that’s the whole rule: review anything, any time; your record only ever moves forward.