My usual way of working consists of having two panels. One on my main monitor in Full Screen a second on another monitor, also set to Full Screen.
When I finish I ensure the position is recorded by using Update Active Layout and checking that the sync wheel has completed.
When I restart Logos the second panel starts to open on the main monitor in front of the main panel but the main panel quickly move to the front obscuring the second panel. The main panel has to be repositioned, the panel moved to the second monitor and then both panels reset to Full Screen.
Bug - Update active layout doesn't! or at least doesn't actually remember it.