“Prompt for User Input” Dubble Underscore Results

If I understand you correctly, that is not possible for showing the Variable Name in the Prompt for User Input action.

If you have a KM Variable named "Prefix__RootName" used in the Prompt, then it will appear as "RootName".

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The results are put into the KM Variable "Prefix__RootName".

Using your variable names, you could use "VarTest__A" and only "A" would be shown, but the results still go into the name "VarTest__A"

If you want to only show AND use "A", then why not just name the variable "A"?