On Partee Design Tool Page, Why can't some text fonts be changed to italics, bold, or modified in uppercase or lowercase?

 On Partee Design Tool Page, Why can't some text fonts be changed to italics, bold, or modified in uppercase or lowercase?

 In Partee design tool, only certain fonts are available in italic and bold styles. It is normal if specific italic, bold, or uppercase/lowercase transformations cannot be applied.

Here are two explanations:

"Chinese font"

Chinese fonts require a larger character set, so importing complete styles such as bold, italic, and bold-italic can result in significantly larger font files in the design tool. Considering the loading time and frequency of use, the system only provides the regular font style for Chinese fonts.

"English font"

Generally, when creating font files in Partee, all font styles supported by the font are included. However, some fonts are designed with limitations to certain styles, such as supporting only uppercase. This is why it may result in the inability to use other styles.