@Jass@duyluong You might recall I mentioned this annoyance in our meeting late last year. I often rearrange editor panes (in my case across 4 monitors) and KS never remembers them. In addition, when a pane is detached and closed, next time I restart/update KS, the pane is put back so I have to remove it again.
You might consider making it one developers sole task to give the IDE some love for 6 months at least.