Notes slide in from the screen edge via a hot side, menu bar icon, or global keyboard shortcut.
The 1.4 update was a milestone for power users, introducing several "pro" features: Release Notes - SideNotes - Apptorium SideNotes 1.4.6
While this specific version is a maintenance release, it belongs to the significant , which introduced powerful workflow enhancements to the Mac note-taking tool. Core Features of SideNotes Notes slide in from the screen edge via