Currently, there is no Revision History available for Forms in Sitefinity.
A feature request has been submitted in the Sitefinity Feedback Portal. To promote the Feature, click on this link: https://feedback.progress.com/Project/153/feedback/Details/205751
. Customer feedback is valuable and Feature request submissions are monitored by our Product Management team. Feature requests are reviewed during the planning phase of each new product release. Once a Feature request is submitted the Sitefinity Community will have the opportunity to comment on and vote for the Feature request.
For detailed information on how to submit a Feature request, please refer to Knowledge Base article 000074190, How to submit a Sitefinity feature request