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To have all changesets highlighted again, click the graph anywhere outside the points on the graph.
Collapsing and Expanding
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Commit Graph
It's possible to collapse and expand Commit Graph: just c lick click the 
button (
or 
) located to the left of Commit Graph to hide it or 
to expand and view it again.
If you have any feedback or requests concerning this feature, please, let us know.