edit the "invalid answer" look and feel

If I may add, it renders some question types downright unusable, because I cannot use that question's own variables to display alternate layers, including invalid answers.

What Jacek proposed... is exactly what I must do for every question.

For drag-n-drops, I need to make the Drop Correct and Drop Incorrect states "the same as Normal", and when submitting, those change to new states accordingly. If I checked "change states until submitted", I get the invalid answer prompt.

For text forms (short answers or open questions), I need to a variable that check if the text entry field variable is empty.

For questions using drop-down menus, I just can't use it, because Storyline doesn't offer variables for each menu if these are left unattended.

I'm just baffled that there still isn't a new feedback layer that overwrites the Invalid Answer one. Please note that an Invalid Answer feedback would also be useful for gatekeepers, like how a user must click and reveal everything on a slide before moving on.