Is it normal that Ethereum Network has a green dot when in use, but the custom networks have a grey question mark? Does it mean the network is not connected?
Question mark is normal it just means it’s a custom network you added rather than a built-in one.
Thanks Luigi! They should use a different icon than a question mark as it causes confusion.
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When you add a custom network to MetaMask — i.e. any network other than Ethereum mainnet — you’ll see a question mark icon next to it in the network selector.
It looks like this:
They also write about it here 
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