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Imagine giving them a copy of the exam to take home and bring it next day. If you can stop them cheating that way, you can stop them cheating using liveworksheets.

Don't add button "Show Right Answers" when the student has finished the exercise

The only way is not to include the right answers. However, that would beat the point of using liveworksheets. :(

You can choose not to show them their right and wrong answers, so in theory they won't know which answers are correct and which are not. In practice, the "clever" student can still pass his/her answers to the rest of the class. As I said, there is no way to stop them from cheating if they really set their minds to it. Liveworksheet is not a tool for assessing, it is mostly for practising - if possible, having fun - and with that purpose in mind, getting the right answers as soon as possible is good for the students, the immediate feedback makes activities more rewarding for them.