Unidentified blue box


I’m working on a chart and just noticed that there is a light blue bar looking symbol in one of my task rows that I didn’t add and cannot land on with my curser (even tabbing through).  I don’t know where this could have come from.  I don’t use this color anywhere in my chart so I don’t know where this could have come from.  Any ideas on how I can get rid of it.?



This looks like it could be a background for a note or symbol text.  Check the toolbox settings for the symbol to see if it has a background set up.  If that's not it, check to see if symbol notes on your schedule have a blue background.  (Format | Default Text | Symbol notes).