Nope.
I sign out of MSFS via menu from my ‘name’ image top right, it acknowledges I am signed out, then MSFS reverts to an early MSFS screen image & X Box pops up with my name & login filled in & has a ‘Lets Play’ green button.
I pressed that & it went on through to current MSFS screens , ready to set scenario. Marketplace Buy/DL still greyed out.
I haven’t found a way to log out & be presented with clean screens to input log in, then the password, as automated password things appear to be operating in the background.
TG