I installed Solidcp latest version recently. Assigned 4 IPs to the system, add 2 of those IPs to Web Sites pool, on a previously created website allocated one of those IP, but don't get the Switch to dedicated IP on website options.

I bet I am missing something simple

You can log in to SolidCP and go to Space & Statistics. And click on Edit Space Details and choose 1 Dedicated IP Address. Go to IP Addresses and select the IP Address you want. Or go to the website and click on Switch to Dedicated IP Address. If you don't see this option then restart your web server after changing the IP address.