A descriptive title for the project. This title will be displayed in the title bar of the QGIS window.

Selected features are displayed on the map using this color.

The color of the map canvas.

Reference files by their absolute path or a path relative to the project file. If you are sharing your project file with others, or accessing it from another machine, choose "relative".

Which ellipsoid should be used to calculate distances when using 'on the fly' CRS transformation.

Choose the units appropriate for the layers in the project.

Use the manual setting to set the precision of the display in the status bar. As the mouse is moved over the map canvas, the coordinates are updated and displayed in the status bar using the precision you choose. Automatic (the default) results in a default precision based on the map units.

The option Enable topological editing enables editing and maintaining common boundaries in polygon mosaics. Editing a vertex in shared boundary will result in updating both boundaries.

To avoid digitizing all vertices of the common boundary select Avoid intersections of new polygons. In the dialog window tick appropriate layers to which the new polygon will be adjusted. Draw the new polygon in the way it overlap the existing one, it will be cut automatically.

Snapping options allows you to set the snapping tolerance in pixels or map units and the snapping mode: to vertex, to segment, to vertex and segment for every layer separately.