I have seen that it cannot be managed and browser (https://www.googlenestcommunity.com/t5/Nest-Wifi/Setup-and-Manage-router/m-p/275600#M30693)
It is possible to delete devices or update the list of those that have been connected at some point it.
Previously connected devices should be removed after 30 days of inactivity, I think it was.
Other than that you have no control over the list of connected devices. If you really want a "fresh start", a factory reset is your only option. Relevant threads from the past:
The truth is that I have many concerns... I am testing the system since I prefer to have everything integrated with the same technology, I have the router and a mesh ap for my house so that the 120mtrs on the lower floor and 90m on the upper floor My question is if I put another router? I understand that it would be the same lan and it will not create more networks for me and I suppose that it will continue to be in mesh, in this way I would have 120mtrs covered on both floors? It's not worth it... I have the possibility of having all the repeaters wired and I tried the wireless three mesh solution and it didn't quite work. With the current system, the ap that is wireless reaches well but from time to time it says to bring it closer. Thank you