This might be possible to add with a Browser Extension if you’re technically minded. I assume that the location of the cards is stored somewhere as local state, so arranging them should be as simple as choosing a shared x/y value on the grid.
I’m kinda tempted to code it myself but honestly I don’t look at my flows that often unless something is totally borked.
Are you aware that one could select multiple flowcards by click and hold on the canvas not on a card and drag a rectangle. When multiple cards are selected you can move them in any direction