This is no big deal, but it's sloppy and shouldn't be in such a mature app.
1/ An open FM window with closed Status Bar.
2/ Open the Status Bar and the Window you've carefully crafted, shrinks by about 50px vertically.
Overall the window grows, to accommodate the Status Bar ... but not enough. Why not?
Features like Popovers, which stretch down to the bottom of the window, suddenly shoot to the side, in order to fit this smaller space. A bit amateur really.
Would be good if FM fixed such a simple and obvious little bug. Surely not hard to ensure, that if there is room in the viewport/display then the window will extend as required. (Plenty of room on my display).