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I do not want to switch the whole SiteCollection back to Classic.
Users are very happy with the Modern Experience

I want to open the EditForm in Classic mode only once.. so my UserCustomAction ScriptLink executes

When Modern Experiences were in preview we had &TryNewExperience=true to switch from Classic to Modern

But the reverse &TryNewExperience=false does not work

Searched for some 10 minutes, but get Switch-back-to-everything-Classic answers only...
I am probably searching with the wrong words

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