Hello,
we installed the ESXI 6.7 and installed vSphere 6.7
all things work fine.
we decide to configure vCenter High Availability (HA).
read documents on docs.vmware.com.
this page says goto configure tab on vCenter server and find "vCenter HA" option,
but in our panel that option not found 
we search about tthis problem but not found any solution.
we will Thankful for your help. 
our system information:
vCenter :installed on embbeded PSC
version : 6.7
clusters HA: disable
