Leo 6.2-b1-devel, docks2 branch, build bf16967989
2020-03-05 11:33:41 -0600
Python 3.8.0, PyQt version 5.14.0
Windows 10 AMD64 (build 10.0.18362) SP0
A 2nd editor window was persisted. But for the first restart, the 2nd editor pane was docked in the upper left corner and was very small, just the way it was when I first created it. I did a CTRL-S save, restarted Leo, and after that the 2nd editor was where I had placed it (in the right-most docking area).
I have noticed this kind of thing before. Either Leo has to be restarted several times before a changed pane arrangement sticks, or possibly after a CTRL-S then restart it will arrange as expected. It's hard to be definite because the behavior is erratic.