Web & desktop app
To convert a list into a checklist, open the item menu and select “Add checkbox to children”. You can also press
Ctrl+Shift+C when focusing on an item.
This will make all its subitems have checkboxes as well. Please note that this action has no effect if the parent doesn't have any children.
First, focus on the item you want to convert to a checklist. This will bring up a sliding toolbar will appear at the bottom. You can then tap on the ☐ icon (checkbox icon) to add checkboxes to its children.