Please add a Yes/No confirmation box when clicking on the 'Sign Out' button on any of the Account Switch browser entries (https://account.proton.me/switch). I think this is not the only page in the Proton Services where such confirmation would be more comfortable for the user. It happened to me several times that I wanted to choose another account from the list and accidentally clicked on Sign Out - resulting in using my password manager and Two-factor Authentication again to Log In (to fix such accidental misclicks).