Electrum automatically converts all bitcoins in my wallet to corresponding EUR value in a separate column.
Sometimes I suspect that the conversion rate seems not the most recent one.
It does not take so long, just a few couples of minutes as pointed out by OmegaStarScream
From which server/source is the rate retrieved?
Specifically for the EUR - itBit, Kraken, BitcoinVenezuela, coindesk, Bitstamp
Where can I find the (virtual) EUR sum of all my BitCoins?
Read the sum of a all filled 7 addresses
Just look at the bottom left of the window of your electrum wallet, next to the green dot