SCRUB mode : piano keys - blue dot no show

The SCRUB function is extremely useful, especially for poor readers like me.
Unfortunately, I discovered that when using this function, the piano keyboard keys are not activated (there is no blue dot) when you move the playback head on the staff.
Is there a parameter to validate that I haven’t seen?
Merci !

No, there’s nothing you’re missing: we don’t update the Keyboard panel during scrub playback, only during actual playback. I’ll make a note of this as something for us to consider in a future version.