Go here:
Tools > Preference > Transactions (tab) > Coin Selection (last option) > select Priority or Privacy
It is done automatically. Anything more you have to do it
manually by either creating transaction on your own by selecting the UTXOs or selecting multiple addresses from its tab and then
Right click > Send from.
p.s. If you want I can explain how to create a raw unsigned transaction with the UTXOs that you have in mind (2 different ways) and then sign it inside your Electrum.