Yes, the admins can remove the sub-tab from the frontend as per the requirement. Follow the below steps to do the same.
Login to Backend
Navigate to the Product Designer ➤ Manage Layouts, you will land on the “Manage Layouts” page. Now open the layout in the Edit mode.
To delete any sub-tab, it should have the Dropdown icon to the tab. Now click on the Dropdown button and you will get the list of all sub-tabs.
Now deselect any sub-tab under the main tab and click on the “Save” button to save the configurations. Through this way you can disable any subtab on the frontend.