edt-keep-current-page-delimiter is a variable defined in `edt.el'.
Its value is

Emacs MUST be restarted for a change in value to take effect!
Non-nil leaves Emacs value of `page-delimiter' unchanged within EDT
Emulation. If set to nil (the default), the `page-delimiter' variable
is set to "\f" when edt-emulation-on is first invoked. This
setting replicates EDT's page delimiter behavior. The original value
is restored when edt-emulation-off is called.

You can customize this variable.