Having the planner window “attached” to the target dialog is both a bit odd from a UI perspective; and problematic from a screen real-estate issue. The combined dialog and window is quite large and thus a problem for smaller screens. It would be a big improvement if the planner could be moved separately from the dialog.
I understand there is a technical challenge in doing so since the target window is a dialog. From a UI viewpoint, it might be better to bring up the planner from right clicking the target “gear” icon rather than having it attached to the target dialog.