The ETH testnets are locked, but there is little reason for that. Most users do NOT need to access them, and I’m sure it causes confusion.
Please make the Ropsten, Kovan, Rinkeby, and Goerli testnets unlocked so I can remove them, hide them, or move them lower in the order. Or, just make a setting to “hide testnets” so I can re-enable it when I need to do work on one of them.
I’ve been using Metamask for quite a while and I love it. I have added a number of additional networks, but they all sort below the testnets that I almost never use. It’s inconvenient and seems silly.