Go see MarcBed answer further down the French conversation.

Bonjour Je ne peux pas transmettre ma declaration d'impot du Quebec car la formulaire TP-80C est ouvert meme a zero. Comment enlever cette formulaire dans Turbo...

I tried to close T2125 first and TP-80 next but it did not work.I had to close Annex L with the same process you described (close current then close unused) and...