The function " Modify change history" is only available in connection with the installation of the Comala Document Management app.
Use Cases
(1) Show only published versions
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There are page versions published by using the app Comala.
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You only want to see the published versions.
(2) Show published versions more visible 
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You want the published versions to be more visible in the "Page History" of your process or workspace.
Both cases are realized with this function.
