Definite solution

1. First go to Efile reports and make a pdf of the rejection incase you are later questioned

2. Open file, uncheck all e-file boxes such as EFILE Extension, Efile returns, etc.

3. Form 8879 and Efile 4868 worksheets should be clear now.   CHeck by pressing F6 to see if Efile for extension is now gone, and F6 8879 for that form, and Form 8453 if you had attachements.    All efile should be clear now.

4. go to menu bar, chose SAVE AS.   It will default to same file name, OK, overright the existing file.

5. Close return.   It will disappear from Efile center.   

I've tested this and it works - I had quite a few for various reasons not go through (usually all but one or two, this year weird - multiple).