Here's how you can enable collapsible lists and other lines in Joplin:
- Enable the beta editor:
Tools>Options>General>Opt-in to the editor beta - Install the Extra Markdown Editor Settings plugin and restart Joplin
- Enable code folding:
Tools>Options>Extra editor settingssidebar item > CheckEnable code folding> Change other settings while you're here
Click ⌄ left of a line to collapse or fold it.
Click › left of a line (or the … button on the right) to expand or unfold it.