Silverstripe：删除查看器组选项卡

I'm trying to remove the 'ViewerGroups' tab from the back end of the CMS. I've tried:

$fields->removeByName("Root.ViewerGroups");

and

$fields->removeByName("ViewerGroups");

but neither seem to be working. Does anyone know how I can remove this tab?

You need to access it in the existing tab object:

$fields->removeFieldFromTab('Root.Settings', 'ViewerGroups');