According to an official announcement, users must update to version 1.5.0 or higher to enable custom network support limited to EVM-compatible chains (blockchains running Ethereum code).
ETH
Summary
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Terms & Concepts
EVM-compatible chain: A blockchain that supports the Ethereum Virtual Machine, enabling Ethereum-style smart contracts and tooling.
Custom network: A user-added blockchain configuration in a wallet that allows connections beyond default networks.