This policy setting allows you to specify the minimum zoom level percentage at which point the expand/collapse on-object ...

This policy setting allows you to specify the minimum zoom level percentage at which point the expand/collapse on-object UI stops rendering.  Regardless of the value specified for this policy setting, the expand / collapse feature is still available from the context menu for headings.If you enable this policy setting, you can specify a minimum zoom level percentage from 0-500.If you disable or do not configure this policy setting, the minimum zoom level is set to 50%.