The priority order of characters is as follows.
- Half-width (symbols > numbers > uppercase letters > lowercase letters)
- Full-width (symbols > hiragana > katakana > kanji > numbers > uppercase letters > lowercase letters)
- Half-width katakana
Checkpoints when the order is not as expected
- Check if there is a blank space at the beginning of the title
- Depending on the viewing environment, characters may look the same but actually have different character codes
Example: ➂ (U+2782) and ③ (U+2762)
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Related: Can I change or fix the display order of manuals?
https://help.teachme.jp/hc/en-us/articles/900005508226
Related: How can I display folders and subfolders in the order I want?
https://help.teachme.jp/hc/en-us/articles/26816537142169