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in a beforeLoad, grab the form from context, get the sublist you want, set its displayType property to hidden.

```define(['N/ui/serverWidget'], function(ui) {

	const beforeLoad = (context) =&gt; {
		const form = context.form;
		form.getSublist({id: '[sublist_id]'}).displayType = ui.SublistDisplayType.HIDDEN;
	}

	return: {
		beforeLoad: beforeLoad
	}
})```

Read your question wrong.  Sorry.  This will hide a sublist, but not a subtab.  My apologies.