Do I understand correctly that when creating a transaction I need to add, say, 15 of my own btc addresses taken inside my Electrum wallet - with random amounts and returning the balance to the original bitcoin address using bc132131exempl, using the function (!)
And before creating a transaction, do I need to make sure that funds are sent to these addresses from 15 btc addresses? That is, I need to distribute the wallet balance into small amounts in advance. It’s just that in this case you will need at least two transactions, one for preparation, the second for CoinJoin.
Coinjoins in Wasabi 2.0 are automatic. You just use your wallet normally, coinjoins will trigger after you receive new funds or create change from sending funds. If you already have funds in Electrum, you would have to send them to Wasabi using an on chain transaction since Electrum seeds can't be imported into most (any?) other wallets.