Inkscape is quite customizable. There are two ways to do so: through the Inkscape Preferences dialog and through modifying files in the
share/inkscape directory (or
Inkscape is most easily customizable through the Inkscape Preferences dialog (File → Inkscape Preferences... (Shift-Ctrl-P)).
There are too many options in the dialog to cover here. It is worthwhile to scan through the options under each entry. The most important options have already been mentioned ...