The system font, NanumBarunGothic only supports Korean and English.
Due to this, if you try to use letters from countries such as China or Japan, some letters might not show up properly.
In order to use letters from other countries, you need to add your own fonts to weMX Designer.
Go to [Menu] – [Project] – [System Settings] – [Font].
Click the [+] button to add the fonts that supports other languages.
For example, in order to use Chinese/Japanese, you can add NotoSansCJKkr-Regular.otf (provided by default) to use Chinese/Japanese letters.
In order to use Arabic letters, use add NotoNaskhArabic-Regular.ttf. For Thai letters, use NotoSansThai-Regular.ttf.