Hey Anuhya,Thank you for the prompt reply.I am looking for a business usecase where both are being used in a perfect sense.In any given usecase we are ending up leaving the one eligibility  criteria to all visitors as we are defining the specific criteria at offer level. ThanksSrinivas

I see two places where we can define qualified audience either rule based or segment based while creating and serving offers in AJO.Offer eligibility while creating offer.In decision eligibility while creating Decisions.why do we need at offer level when offer can't be delivered independently with o...

As a work around, replace with any other segment and then will get option to delete, for couple of segments which are greyed out and not letting to remove from segment drop zone.

no Idea I just user all visitor segment for time being, looks like an UI issue.