UPDATED 1/28/26:
Being the more robust survey designer, Connect is primarily what my organization uses to create Survey123 forms. These forms are accessed under a variety of conditions: Sometimes via the Web App, sometimes in mode='edit', etc. Within Connect, you can only preview survey behavior as though it is a new form in the Field App. This makes creating and troubleshooting forms that are used differently a time-consuming, more frustrating process. Given how frequently we create forms that rely on an existing record and are filled out in a browser, having to publish the survey in order to confirm behavior is clunky. The preview shown in Connect can be explicitly misleading, at times.
Please consider elevating Connect so it offers better preview abilities of survey behavior.
Original post is below:
When designing surveys to behave differently if users open them in mode='new' vs in mode='edit', the process of testing/reviewing your work is clunky. It would be very helpful if Connect could simulate both circumstances, so you can preview both sets of form behavior within Connect without having to publish to examine form behavior.