Fonts lets you set the system fonts and the size of the font caches. There are three types of system fonts: plain, bold, and fixed-spaced. Individual fonts have additional popups that let you choose among style options available for that font. You can set the size, from 9 to 12 points, with the Size: popup.
Click the Cache tab to set the size of your font caches:
BeOS includes a TrueType font renderer, which displays TrueType fonts in almost any size. The standard set of TrueType fonts included with BeOS is stored in /boot/beos/etc/fonts/ttfonts. These are the default system fonts; you should not change them.
You can purchase or download additional TrueType fonts in Windows (not Macintosh) format and add them to BeOS:
To add PostScript fonts, make a new psfonts folder in /boot/home/config/fonts, and put your fonts there. Rescan or reboot, as you would for TrueType fonts.