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