
From the official doc, we can know that
The recommended alternatives for the no-merge functionality in Microsoft Edge are one of the following actions:
- Use Profiles in Microsoft Edge - Each profile maps to a different IE session for IE mode pages, so it behaves identically to the no-merge option.
- Use the
--user-data-dir=<path>
command line, but with a different path for each session. If needed, you can create a utility for the user to run that launches Microsoft Edge and changes the path for the session.
So I suggest that you can use different profiles in Edge to achieve no-merge behavior. As far as I know, there's no other way. You can also check this thread which has the same issue as yours, the Microsoft official account also only mentions the above two alternatives.
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Regards,
Yu Zhou