Using Visual Studio Enterprise 2019 16.2.5, I don't have a "Reset Clean" option for testing.
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@SamuelEnglard Thanks for your question. It looks like you're having an issue with the product itself, rather than an issue with the documentation. Here are a few options where you might consider asking your question:​
https://social.msdn.microsoft.com/Forums/vstudio
https://www.reddit.com/r/VisualStudio/
As well, you might also consider using the Report a Problem tool to report the issue.
I don't see Reset Clean in VS 2019 16.4 either, so it could be the product changed and the doc needs an update. I'll ask about it.
I understand the feature has been removed, so this will need a doc update. Waiting for additional info first.
Yes, we've removed the menu option, but you can still use a more explicit way to clean the LUT data in Tools > Options > Live Unit Testing -> Delete persisted data when Live Unit Testing is stopped.
We should update the doc.