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thanks for help
Do you mean, skip pages? You may consider doing that by condition. Please check this guide for more details on how to do it in the form:
If you have any questions, please let us know here.
I need apply this condition to the back button, is it possible?
I don't think it's possible. You may consider doing the workaround such as hiding the back button and change the text of the next button to "Back". But still, add the skip logic so when they click the button, they'll be redirected the previous page.