The Dataform FAQ page has this Q&A:-
How can I completely reset a Dataform activity?
In the Dataform administration section of the Settings block, click 'Renew'.
What happened today was I edited one of my dataform views after many months. For some reason I miss-clicked my mouse and ended up clicking the reset button by mistake. That reset the HTML code of my view. The dialogue screen is the "Views" tab and there is NO "Save" button. So once you click the reset link, that's it!
My question is this: is there no need for a prompt to alert the user that he/she is about to do a destructive command that will reset the view, and that the user should confirm YES/NO before continuing?
Actually I am using dataform release version 2.8.6, which is quite old (year 2014). So perhaps this has been solved in subsequent updates to the mod. If this has has already been rectified, then please ignore this useless rant.