The field close to the top was very convenient as schro mentioned, even if no restriction was entered (by clicking it and pressing enter to submit)
Side Note: I am wondering if there is any way to trigger "Submit" by pressing Enter universally on Open / Edit route. It works by clicking (setting focus) on one of the text boxes and even by clicking in general area of the "panel" where days of week are entered. It would be nice if the page somehow started with focus on a convenient field or panel so that Enter would work right away, without having to click anywhere.
Side Note 2: I think the Enter to Submit somehow works in Opera browser (IIRC) but not in any of the more popular browsers (Chrome, IE, Edge).