Safe Browsing - reached 64 devices limit - how to remove/find the list?

[TurboWG]

Anyone know if there's a way to locate this list of 64 devices and remove them all at once?

I tried deleting the devices in the offline list but that did not do anything for me.
It still shows I've reached the 64 devices limit after.

 

[TurboWG]

My router is BE92U. Using the latest iOS app.

Also, deleting the all the devices in Parental Controls on the WebUI did not help.