Add fifth virtual network card to Analyzer 5.6

Hello,

I have a VM FortiAnalyzer 5.6.

The default of the device is 4 nics, if I try to remove one nic or add one, it seems that the OS doesn't respond to changes even after reboot.

Now I have only one interface port configured

But i want to know that i can delete and add interfaces as I like of future reference

Is the default of the OS only 4 ports?

If I make changes in the VM hardware shouldn't I see it on the OS (add/delete Vnics)?