Show history on an object will show all revisions for which the object has changed, for each revision the tool will show all objects changed in that revision. It will highlight and show the change for the object chosen for each revision.
There is not currently a method to only show the changes to the object chosen for each revision.
If you wish to request that feature you can do so in our uservoice forums.
http://redgate.uservoice.com/forums/390 ... ce-control
These forums are actively monitored by our development team and allow our users to request features and vote on them.
If a feature receives a significant amount of votes or is deemed to have merit development may include the feature in a future release.