SharePoint list forms on modern experience lists will open in a dialog side box by design (at the moment of writing this post, no out-of-the-box options are available to change this).
In my opinion for non-customized forms that’s ok, but for PowerApps forms in SharePoint lists, the layout is not fine when the form layout becomes large, due to currently the forms inside the lists not being…
Continue Reading michelcarlo’s Article on their blog
https://michelcarlo.wordpress.com/2019/01/20/sharepoint-modern-lists-force-forms-to-open-in-full-size/
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