The documents history can be activated via the settings. You can get more information on the settings under documents settings. After activating the history all changes of  the documents are archived. Via the history you can see all document changes and reset them if necessary. You can call up the history in the array "documents" via the context menu. (Click on a document with your right mouse button).

 

Delete:

Deletes the selected entry after a security query

 

Delete all:

Deletes all entries after a security query

 

Reset:

Resets the selected document