Clicking the ``Configure/Fonts'' menubutton displays the

Figure 5.13: Font Configuration Window
``Font Configuration'' window shown in figure 5.13. You can individually customize a particular widget type font's (1) family, (2) slant, (3) weight, and (4) Size. To set all the widget fonts together, follow these steps:

Figure 5.14: Font's family options
from figure 5.13, clicking on the Default font's Family value will display a popup window for you to choose a font family (see figure 5.14). Repeat this action for the slant, weight and size attributes.
You'll notice that there are only two options available for the
Listbox' family selection: (1) courier, and (2) fixed. These
two fonts have a fixed character size (that is, each character occupies
the same width) so that listbox columns will always be aligned.