You can display the staff next to the instrument. It'll display the accidentals of the current key.
To activate this, make sure the instrument is visible.
👉 Tap on the instrument title:
👉 Tap this icon:
Not available in "Scales" mode In the "Scales" mode of the app, the staff will display no accidentals. That is because the "Scales" mode is scale-based, and not every scale can build up a mode. Each scale has its accidentals related to every single note.