Maybe this has already been suggested, like Nov 2, 2009 maybe.
Let's say I have my Targum Jonothan linked to my BHS and I'm moving along, quickly glancing serripitiously over at my Lexham interlinear for the 'real-McCoy'. I change to a new OT book.
Everybody follows along, but the targum has to switch to another targum resource. So, if I have the font size set, it completely ignores it and 'starts anew'. This happens on my commentaries as well.
I mentioned Nov 2 2009 as near the L4 rollout, since when they added column views later, the exact thing happens. If you're reading along in a commentary in a column view, and switch to another book in the same commentary, it will switch you OUT of column view to scrolling etc. I haven't tried what happens to the visial filters.
And it's quite maddening (DP's March madness rant) for any of the papyri, DSS Biblical, targums and commentaries.
I have to figure the Logos Biblical guys (seems all guys) must use Logos. They don't become maddened?