Pinning holds a note in a Pinned section at the top of its folder, above the date groups.
How to pin
On desktop, right click the note in the list and choose Pin Note, or open the note menu in the editor header. On mobile, open the note, tap the menu in the header and choose Pin Note.
How to unpin
Same menu, which now reads Unpin Note. The note drops back into its normal place in the list, sorted by date like everything else.
Pinning is not an edit
A pin or unpin leaves the note's modified date alone. The Pinned section keeps its notes in date order, an unpinned note lands back in the day it was last edited rather than at the top of Today, and the change still syncs to your other devices.
What to pin
The two or three notes you open every day: a scratchpad, a running to do list, the active project. Pinning is per folder, so each folder can have its own pinned notes at the top.
If everything is pinned
Then nothing is. The section earns its place by being short, and a pinned note you have not opened in two weeks is ready to be unpinned.