MuseScore 4 : Properties Panel
MuseScore 3 allowed the user to vary the width of the Palette, Property and Instrument Panels, by mouse clicking on the right hand edge. It enabled the display of the full score width at a higher magnification.
But this does not seem to be possible in MuseScore 4 (including 4.0.2), unless it is achieved now by some other means than the mouse?