If you're using ProConnect Tax:

1. Click on Income > Pension, IRAs (1099-R) on the left panel;
2. On the dashboard on the right, click on the trash can icon to the far right on the line you'd like to delete.

right click and remove the form or also on income find the 1099 and remove the check mark. also to the right place do not show next year.

@Hugosky2  What you suggested is for ProSeries but that is not how ProConnect Tax works.