The electrum client asks the server to fetch the balance and TX history for each address you see in your Addresses tab.
It has to do this otherwise you don't know if there are any transactions or not.
Normal electrum servers do not log this activity.
The only thing they log is the count of how many addresses you requested data for.
I see, then its better to have multiple wallets for different roles, otherwise the wallet leaks out privacy info.
No, that is kept in client and not sent to any server.
The servers never get your seed or private keys, so it is impossible for a server to steal your coins.
The priv key and seed i`m not worried about , its a watch only wallet, i was worried about master pub key.
Yes, as explained above, electrum sends the request to update the balance of all the address in a wallet, this is what sync does, so server does knows all the addresses of a wallet. And maybe some of the servers do keep logs, there's no way to know for sure whether they do or not, I think this might be the reason why during a privacy rating review recently, electrum had a very low rating as far as privacy is concerned.
I think it has the best privacy if you know how to use it.