Ou of band, sort of like taproot and musig schnorr that always look like singlesig on-chain?
Discussion
nono sorry wasnt clear
you have use the cli wallet to export the partially signed tx and import it into the other wallet signers
its a huge UI hassle and nobody does it
if interested:
It seems possible to create a program similar to Bisq that could do trades using multisig escrow with Monero and simplify the UX of what is done with Monero CLI only and multiple wallets.