I think you are not using the same version as me, I downloaded the extension from github. Anyway, what you see after you click the chart/graph icon in the right?
It seems to be 2.3 according to the changelog folder, but as long as I downloaded from github it may be something like 2.4alpha.
Btw did you clicked the graph/chart icon at the right side of the 'evaluated' column? It appears in the screenshot. If yes please post a screenshot, the remove evaluation option is available since 1.0 according to the changelog.