1. Start note input, then click the Grace Notes button in the Notes toolbar at the left of the window.
  2. The caret becomes less tall, indicating you are now inputting grace notes.
  3. You can also use the key command /.
  4. By default, grace notes will be slashed.
  5. Press Alt+/ to toggle between slashed and unslashed grace notes.
  6. You can always toggle existing grace notes from slashed to unslashed (or vice versa) using the Grace note type properties in the Grace Note section of the Properties panel.