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In layout setup there's a check box "save record changes automatically". Clear it.
This is just the first step. Users can still commit (save) the record by clicking the laout background. To prevent this, put an empty, invisible web viewer behind all your fields and buttons and sized to cover the entire layout background. Now all you need to do is add a button to do a commit record to save the record. You can also add a cancel button that reverts the record.