Change the format of an item

Select one or more items and press a number from 1 to 6 to change how they look. While editing, press Ctrl/Cmd with the number.
1 — Text
2 — Bullet
3 — Numbered list
4 — Task (checklist)
5 — Quote
6 — Code
Three selected items shown as bullets, a numbered list, tasks, a quote and code, then back to text.
You can also change the format from the item menu.