I wanted to test my dapp with the Coinbase wallet extension so I installed it on Opera / Linux Mint (running in Virtualbox) and there’s no “Default network” option in the settings, and the “Networks” page doesn’t allow selection of any network (clicking them does nothing). So I installed the wallet extension on Brave and got the same result. Then I downloaded the SRWare browser to Windows 10 and installed the wallet extension there, again with the same result.
I used the correct download URL each time (the official download the Coinbase site links to).
I’m sure I’m missing something really obvious, but how do I switch networks?