Global settings modify the appearance of your sheet. Here you have the ability to hide the native sheet title creating more real estate for what matters. Furthermore, you will be able to also hide the top sheet menu bar visibility and hide the base sheets from the Qlik Sense Sheet Navigator for full control over which sheets are exposed to the users.
Alternate States permit you to assign the Vizlib Sheet Menu to an alternate selection state. If you want to add the object to master visualizations, you need to set State to "Inherited".