This Joplin plugin adds text capitalization options to the Markdown and rich text editors. In the menu Edit --> Capitalization you will find 6 commands that can be applied after selecting text:
- lower case
- UPPER CASE
- Title Case (based on title-case)
- Sentence case
- ｆｕｌｌｗｉｄｔｈ
- halfwidth
In addition, Suicase provides a command that allows sorting lines in a case-insensitive manner.