Help!: Map area not resized in Edit mode

When starting a new map, the map area is automatically adjusted when resizing the browser's window, which allows to make the drawing area quite large. This resizing also works once the map has been saved, in view mode.

But when entering the Edit mode, the map frame always has the same (small) size, whatever the size of the browser's window. This happens using either Safari or Firefox.

Do you experience the same issue?