The bulk editor currently does not support adjusting object policies, so you can't use it to (for example) change the visibility of a large number of tasks.
After T10973, the bulk editor side of this is fairly easy. The UI side -- where we need to render a policy selector control dynamically in pure Javascript -- is not.
In the meantime, a possible workaround is that all modern `*.edit` API methods do support policy editing, so you may be able to use the API, rather than the bulk editor, to make sweeping policy changes.
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// Originally //
The action menu in the bulk editor has no option for "Change Policy" / "Change Visibility" / etc
{F134614}