Quote from: Michiel on May 02, 2024, 02:06:45 PM

Wallet C (actually it was the first one that I created) contained all 3 seeds, I didn't know that was possible.
I assumed when creating a wallet and you insert the 3 seeds, it would store the first seed and compute the public key of the other two and store them.

Fair enough, the option doesn't have the same message in "Enter consigner key" where it's explicitly noted that putting a "master private key" will enable you to sign for that particular cosigner.
The "Enter cosigner seed" option is listed an another option without a note.
That may actually confuse someone who's new to Electrum or Bitcoin in general.

Quote from: Michiel on May 02, 2024, 02:06:45 PM

-snip- It's confusing the UI is showing the "main seed" and not the others.

It's noted with the message "Your wallet generation seed is:" because that's created when you make that wallet.
The seed phrases of the second and third cosigners are created by their respective wallets.