This should show the list of networks available in Brownie.

brownie networks list

In the Ethereum (persistent network) there is no Ganache(local) network

Add a network to Ethereum 

brownie networks add Ethereum ganache-local host=http://127.0.0.1:7545 chainid=1337

Name of the network- ganache-local

host- where ganache endpoint is listening i.e. RPC Server

chainid – for ganache it is 1337

Output–