Solved
I wonder whether that is a program bug.
Unlike updating/editing your 1099-INT and 1099-DIV which is insanely easy, -- editing or updating your Investment Sales after having entered them is a painful 2 or 3 level effort
There is an edit button and a Trash Can symbol on the Investment Sales Summary screen. Do you have a scroll bar at the bottom the Summary screen where you can scroll to the right?

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