There are a number of options for the appearance of notes and noteheads project-wide that you can choose from on the Notes page in Engraving Options.
The options on this page allow you to change the design, appearance, and position of noteheads, ledger lines, stem flags, and rhythm dots. You can also change the appearance of double whole notes (breves) and the size of grace notes relative to normal notes.
There are musical examples for many options to demonstrate how they affect the appearance of your music.