Welcome to the VMware Communities forums. When you install ESX(i) and vCenter you get a 60 day evaluation of Enterprise Plus. So if you haven't applied a license yet, you'll be able to setup HA / DRS and run it during the trial period.
If you already have your licensing in place I would guess that it is a difficiency in the client (i.e. the options should be greyed out) but I would think you would get an error try to create the cluster.
Dave
VMware Communities User Moderator
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