Well, that was rather frustratingly difficult to figure out in several ways, but it appears to be fixed now. The legend position and the 'mode' should now be 'sticky' (as intended and, in the case of 'mode', as it used to be). That is, if you move the legend or change the 'mode' of Recently Active Threads, then the next time you visit Recently Active Threads the legend position and 'mode' that you most recently selected will be used.
Unfortunately, this probably also made these (once again) 'sticky' for Anonymous Monk which I'll look at addressing next.