Go to Federal Taxes then to Income, then scroll down to Retirement area and to the 1099R (untitled) and to the right of it, there should be a Delete icon to hit and remove it.
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If that does not do it, then try this.
go to MY ACCOUNT on the left side of the screen
Then click on TOOLS
then below the boxes will be DELETE A FORM
click on this and find that pesky 1099R (untitled) and delete it.