@William67 

Hi William,

When you go to Access Control and enable it the online device list is the list of devices that are currently on the wifi or wired to the router.  When you add devices to the white list and save it should then allow those devices in the whitelist to access the internet and network resources but the other devices may still show connected to the AP, they just won't be able to pass any traffic.  

If it is not working there is one thing we can test to see if its the feature that is the issue.  Change your SSID name,  Thus breaking all device connections.  Then setup one single device but add it the white list.  Once its confrimed and is working then try to add a second device.  If it does not have internet then the service is working properly.  If it does we may need to work with the software team to see what is going on.

Also by turning off DHCP you may not actually need to use Access Control. With DHCP turnned off, unless you have another device providing the DHCP service no device will be handed an IP.  If you don't then just setup each device statically, assign each device an IP address.  Devices that are not setup statically can't access your network becasue they won't have an IP.