Hi @mallison14
Welcome to the Canvas Community. To do this, head back to the assignment group on the Assignments page and click the Options icon for that group and click EDIT; in other words, the same place where you created that rule, to begin with. On the ensuing dialog box, simply click the X next to the assignment name that you have in the "Never Drop" area. There is a screen capture showing what this will look like under the Select Assignment heading on this page: https://community.canvaslms.com/docs/DOC-9880-4152232976 Again, just clicking on that X will remove it. Save, and you're done.
Hope this helps, Megan.
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