IDF designated a humanitarian zone at Al-Mawasi.
https://www.forbes.com/sites/siladityaray/2023/10/18/israeli-military-announces-humanitarian-zone-in-southern-gaza-and-says-aid-will-be-sent-if-necessary/

Now I'm speculating here a bit, there could be an alternative use of this place besides the destination of humanitarian aid.
In theory they could amass everyone in Gaza there like herrings in a tincan, then let them out one by one checking each and filter Hamas members, they probably have lists about people, maybe not of the smallest fishes, but they could catch some larger who might try to escape with refugees.
But will be there even a ground offensive? Fighting house to house? Poking into bunkers and tunnels? I don't think many of the Jewish soldiers has such as competency. And the ones who have might just melt away in the concrete jungle.