You can connect to any Electrum Server of your choice.
Bitkit defaults to our own Electrum server. The default params are as follows:
ELECTRUM_BITCOIN_HOST=35.187.18.233
ELECTRUM_BITCOIN_SSL_PORT=8900
ELECTRUM_BITCOIN_TCP_PORT=8911
ELECTRUM_BITCOIN_PROTO=ssl
If your Electrum Server is Tor-only, you'll need to connect via a local network or through software like IP2TOR, ZeroTier, Tailscale, or WireGuard. Remember, Bitkit can only connect to an Electrum Server, not directly with the Bitcoin Core RPC.