AQSA NEAZ

How to design this type of flat slab? It does not fulfil the DDM criteria. First image is UGWT top slab and second one is OHWT top slab

Pls explain auto mesh option and divide shell option. when I select auto mesh option etabs show mesh 1x1 but the slab is not divided by 1x1 in actual, but when I divide shell by 1x1 it actually shows that slab is split into an area of 1x1. which type of meshing is correct in every situation. what type of meshing we should do. pls explain. I got really confused.

how to check slab deflection manually when slab is the combination of 3 different shapes?