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Our Form Builder and forms work in Microsoft's Edge browser. I've just created a new form in Edge, and it was saved without any issues:
I've also used the Delete button to delete a form in edge, and it too worked correctly:
When you are unable to edit or delete a form, is this happening to only one of your forms, or to many/all forms?
Which version of Edge browser are you using?
And could you please provide an example form where this is happening, so that we can try and see on our end if there is anything wrong with that particular form that might be preventing it from being edited correctly within Microsoft Edge browser. Thank you.