[AC Question]

I'm so grateful to anyone who can help. I cannot seem to retrace my steps; however, yesterday I was trying to make a change for something and I hit something along the way quickly that changed the green ticker color number (green circle with number in white) on my text message indicator to a light blue and now I can't see it - my eyesight is poor. I have tried everything to find what I did and scoured Google. I know it is something simply, but it's not registering with me. Can anyone assist me? Abundant thanks! With kindness!