The current "Map View" tab on the left side of Marble (MapViewWidget) should be optimized to occupy a smaller height in total. To do that, a toolbar should be introduced.

• Hide (don't remove) the Projection, Celestial Body and Theme labels
• Hide (don't remove) the horizontal line
• Create a toolbar with the following entries
• A radio button group consisting of two buttons with icons
• (||) (Globe Projection)
• [+] (Flat Map Projection), with a drop-down menu for further projections. A click on the button should toggle to Mercator projection, the dropdown opens a menu that shows all available projections except Globe (currently Mercator and Equirectangular)
• A separator
• The existing combo box to select the celestial body

Please keep the existing combo box at the bottom of the widget as is.