Hi , i have the same scenario but i have a home page like below , and when we click new from SP it will open this page , and depending on the option it will navigate to the screens

now for edit , i have 3 edit forms and i have added below script on edit property of sp integration but while clicking edit from sp list it end up in opening the home screen
Refresh('IT Asset Handover Form'); Set (SharePointFormMode, "EditForm"); If( SharePointIntegration.Selected.'Request Type'.Value = "New User) Start",EditForm(newfrom1);Navigate(Newrequestedit,ScreenTransition.Fade), SharePointIntegration.Selected.'RequestType'.Value = "Replacement) Start", EditForm(Replacmentfromedit);Navigate(Replacementedit,ScreenTransition.Fade), SharePointIntegration.Selected.'Request Type'.Value = "Return) Finish", EditForm(returnformedit);Navigate(Returnedit,ScreenTransition.Fade) )
please help