At the moment you can select which list to open, subscribed, local or all. However, when you have multiple accounts, you can't pick on which server.
I have accounts on lemmy.world, lemmy.ml and lemmy.studio configured in that order and selected subscribed as prefered community list. With lemmy.world as top instance in the list I'd expected that to be the 1st to open. However, it's subscribed@lemmy.ml that's opened at the start. I'm guessing that's due to alphabetical ordering.
I think it would be useful to be able to select the instance as well as community list. This either by selecting it or ordering the instance list (start with the top one)