You can track all the changes you have made to the Notes and Data panels on an entity under the history tab of the entity.
History on Notes and Data panel
Note1: The entity must be saved under a database for the changes to be recorded in the history panel. The history panel will not appear otherwise.
Note2: At the moment, there is no option to restore to a previous version of the entity. You can only see the changes made to an entity and the user who made them.