how to change from standart to 2fa?
You will have to create a new wallet, select "Two Factor Authentication"... then read all the information about how it works, and how much it costs! 2FA is NOT a free service... more info here: https://api.trustedcoin.com/#/electrum-helpQuote
and how to change the appearence , 0.123 BTC but it appear 123 ...thanks
Did you try looking in the settings? Specifically: "Tools -> Preferences -> Appearance" 
You'll want to change the Base Unit to BTC