Add 'Change Content Type' control
There's no way for the user to change a content type while editing in a form in 365.

Thanks for your suggestion. I will update the ticket if we have anything to share on this idea.
Cheers,
Euan
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T Chesson commented
We need it for Classic Designer as well.....very important
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Karl Gerd Schneider commented
Without a Control "Change Content type" - such as On Premises - NINTEX Forms for Office 365 is useless for Libraries with multiple Contenttypes...
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Charles commented
Does this mean: if a user begins filling out a form as one content type, they're unable to "convert" their existing form to another content type (which may or may not share one or more site columns with the current content type)?
I'm planning on doing something similar; except that I'm changing the content type from within a workflow after an approval.
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Romain Dalle commented
This is must have!
As long as we don't have this control, we can NOT plan libraries with several content type if Nintex Forms for O365 is deployed.... and it's heavy in terms of consequencies !